The Vibe
This handy little vibe makes for a great toy. There is a finger loop on the end that you can slip a finger through. Conveniently placed is the button, that rests against the pad of your finger. There is only one speed to the vibration, however. But you can use your finger to shift and wiggle it about inside however you like. It's small size is deftly suited for this purpose, something larger vibes would have a harder time achieving.

It has a very smooth texture, which is easy to lube and insert. Even better is that without any bumps or ridges along it's surface, it makes it harder for any extra matter to come out with it when using it anally, which is a huge plus for me.

The Vibrations
It uses small batteries, and it can be something of a pain to pop out the bullet to change them out. However it does have a decent enough vibration, albeit that it is only a single constant level. For those liking variety, you probably would rather have something else.

Cleaning
Cleaning the toy is fairly easy. You can pop out the bullet so the entire toy can be immersed. Just don't forget and leave the bullet in it. Soap and water is how I generally clean all of my toys. It just seems to be the safest course, and of course you never need to purchase any special toy cleaner. Which means more cash for toys.

Lube
I think nearly all of the toys out there today are best served with water-based lubricants. I haven't really come across any capable of working with silicone-based ones, other than glass or some of the hard plastics I suppose. Still, better safe than sorry. And there is nothing worse than mixing up the silicone and water lubes, and using the wrong one and ruining a perfectly good item.

Storage
I doubt there is any toy that would be easier to store. It's tiny, after all, so it can be tucked away just about anywhere. This is perfect for ladies, since you can slip it into a little plastic sleeve and take it with you wherever you go.