There are many things to like about this toy - size, speed, versatility, battery life, sturdiness, and compatibility with other toys.

Size:
The size makes it discreet enough to keep in your pocket, purse OR your underpants. You can easily hide this against your skin inside your undergarments. This could turn your regular panties into *vibrating* panties in a noisy situation fairly easily. Pants pocket or skin pocket, this thing fits just about anywhere.

Speed:
I found if you turn the dial only slightly, you can rig it to not be as powerful. For some, the initial new-battery speed is a bit too strong (I found this to be the case for me as well) but it is adaptable if you work at it. The more expensive Pocket Rockets have not had this ability - they are either slow or fast. I prefer the way this one works to having two set speeds.

Versatility:
The size contributes to the toy's versatility. As mentioned above, you can make vibrating panties with it, and if you're feeling adventurous, you can even insert it into your vagina slightly to make this a g-spot stimulator. Because it's intended use is not specifically for this, you have to be especially careful (perhaps inserting it into a condom first for easy retrieval).

Battery Life:
Even at the highest power setting, a single AA battery (which is all it takes) can last up to three weeks with daily (nightly) use. This is especially good if you need to keep it VERY discreet and you don't want to keep a large supply of AA batteries on hand.

Sturdiness:
I have to tell you, I'm pretty rough on my toys. I've dropped, lost, stepped on, rolled over on and squirted on just about everything in my treasure box at least once. It's a sign of my affection. This tiny toy has held up against my worst treatment; I use this one most often, which means it's taken the most abuse. Not a scratch or a ding or a crack on it. Very good for a frequent user.

Compatibility:
Finally, one of the best features of this toy is compatibility. I have a few solid toys with no extra vibration feature and I can place this toy against them and the powerful vibrations turn any of my solid toys into more exciting, vibrating ones.

The Mega Mite has been a long time favorite of mine and will probably continue to be. I can slip away for a few private minutes (because that's all it'll take with this) and my day will improve. Great for a quickie pick-me-up if that's all the time you have.