This vibrator is certainly a big one at 8.5" long and over 1.5" in girth! I imagine that unless you are a size queen and/or an advanced user, this vibrator will be best suited for external use.
The Dazzle Me Sparkle works great on the clit or other sensitive areas, feeling a lot like an oversized bullet coated in a jelly sleeve. And using it as an "oversized bullet plus comfortable grip" toy actually makes the Dazzle Me Sparkle's size a pro--there's a lot more surface area covered than with your standard silver bullet and it's easier, in some scenarios, to position and comfortably hold than a normal, smaller silver bullet.
The adjustable vibrations aren't buzzy, but rather hum at about a moderate rumble that spreads throughout the body of the vibrator from the inset silver bullet. And they are quiet and splash-proof! As a result, The Dazzle Me Sparkle would be a great toy for solo or partner use.

The Dazzle Me Sparkle had a definite plastic smell when I took it out of the packaging, enough that I really made sure to give it a good wash before testing and didn't want to taste it. It also isn't really that sparkly, though it is shiny.
The texture I would describe as being a little bit "sticky", like a gummy bear. As a result the vibrator drags a bit on the skin if it's not slick, which can either be pleasurable or a little uncomfortable. Still, it's a suitable texture for beginners or advanced users.
While the exterior feels like cheap jelly material, this vibrator uses a somewhat safer material called TPE, which isn't as porous as cyberskin. With that said, it still is semi-porous so if you're sharing this vibrator use a condom, and certainly wash it with warm water and soap between uses!

The Dazzle Me Sparkle has really dramatic grooves and flares, which created a rather interesting design that reminded me of a fancy bedpost. These bumps and ridges change the stimulation slightly but I found that the material spread out the vibrations from the core bullet pretty well, so it was really a matter of the shape of the pressure I could apply: pointed or rounded? The girth of the vibrator meant that regardless of the shape I chose, I was still pretty much guaranteed stimulation from the bullet over a nice 1.5" area since the TPE is firm and you can press against it.

I am afraid I am unable to comment fully on the design in terms of internal penetration/use. I am not a big girl, and this is a big vibrator! Even with lube I still couldn't comfortably manage the girth.
However, here's what I hypothetically conjecture: the TPE material is rather firm, and will only yield slightly. Therefore, the dramatic design and girth would be pretty well preserved, giving a lot of interesting sensations and that stretched "hurts so good" feeling.

This toy is the largest one I own in terms of length and girth, so it was a bit harder to stow away than others. The design really isn't the most discreet, but you could possibly pass it off as a cheap (blue) wand massager with a funny shape. Travel with this at your own risk(removing the batteries first, of course) because its instantly recognizable as a sex toy. If worse came to worse on your travels, this might make a decent club.

The Dazzle Me Sparkle greedily consumes 2AA batteries, which are inserted into the screw-off base in the standard one battery up/one battery down position. The cap doesn't have a molded "holder" for the AAs like some sex toys do, so you pretty much just stick the battery poles against the springs of the vibrator and then screw on the cap again. I got maybe 9 hours of play from this vibrator from fresh batteries before it died.

Vibrations are controlled via a turn-dial on the base, and range from mild to moderate/strong, depending on your personal threshold. While they are strongest at the tip, where the bullet is, they can still be felt along the length of the vibe. Since I have a clit of steel, I kept the vibrator tuned to the middle for warm-up and high for everything else. At it's highest level I found the vibrations to be a moderate-arousing and enough for an orgasm, but not a quick one.

The cap has a ribbed texture that makes it easy to find against the softer body of the vibrator proper, and the scalloped-edge dial can be turned when slippery, although not always easily.
The bullet's noise and, to a degree, power is really muted and dispersed by the coating of the Dazzle Me Sparkle, making this a really quiet vibrator for it's size and moderate power output.
The Dazzle Me Sparkle claims to be waterproof, and so far the O ring is keeping the water out in the shower. However, I haven't tried this in the bath and will designate it more splash-proof than water-proof because the battery compartment and O-ring are both cheaply made.

TPE material is safe to use with silicone and water based lubes, but not oil-based. It's also semi-porous so if you share the Dazzle Me Sparkle, use condoms! You cannot boil this vibrator, nor give it a ride in the dishwasher, but you can wash it with warm water and soap, or cleanse with a toy cleaner. Also, because the material is somewhat gummy in texture, it easily attracts and holds onto dust and lint, making it a necessity to wash this toy before each use.

Storing this vibrator is a bit more difficult than with other vibrators because it is prone to attract dust, but is also 8.5" long and 1.5" in diameter. And nothing about it really says discreet since it is pretty obviously a sex toy. In the end I just put it in a plastic bag and into the sock drawer it went!

The packaging is pretty basic: a thin clear plastic case that has a molded area for the vibrator, and a piece of paper with the specs written on it. In no way is the packaging discreet-one look at the case and you can see the toy and the paper background.

As you can see, the paper included claims that the vibrator is multi-speed and waterproof, with "powerful vibrations located in the tip". It also claims to be "hygienically superior" and to be soft and unscented. In addition to these claims, the name of the company is included (Doc Johnson), as well as the usual warnings about not using the vibrator on inflamed parts of the body.
You could not use this as a storage box-when I got the vibrator the front of the plastic mold was dented, and this actually carried over to the vibrator as a dent in the TPE material. As for using the packaging as a gift...well, it's not the most classy of packages, but at least there's no naked women pretending to surf using the Dazzle Me Sparkle.