One of the reviews is listing the battery life as 50mins 
Be aware It can get warm when your using it. This is normal and safe. No ones ever complained about it causing problems on the forum that i can remember and its a very popular bullet here that alot of us recommend regularly. Ive never had an issue with mine
Er 
this is most of my collection
In general the mantric and desire ranges are cracking (also go onsale alot). The mantric real vibe is very popular.
Can vary from item to item so read the reviews, but i have 4 mantrics (wand, bullet, rabbit, pebble) and they are fab, rumbly, strong and quiet (the wand is less so, but its a wand so thats to be expected)
The desire bullet is my fave, but i have a small stash of them. The tango x is stupidly quiet but sadly expensive.
Theres a smattering of my reviews here. But i havent reviewed eveything i own