So, a short while after I got my new 801, the atty died. which stunk, as it was my first atty death. It also stunk that I was broke... so I bumped along with my other pv's, other attys... Then I got some xmas $! and I bought some new attys and tried the 801 again. After careful consideration and comparison vaping, I am really really liking the 801 the best. I love the size of it, it's elegant. I really like the size of the bridge, as I think this really enhances the quality and volume of vapor. After 6 months, I think I've found my model. yeah! Now I want a Leo. lol The 510 is ok, I guess, but it lacks STYLE and I feel, quality of vape. The 901 is about useless ( to me), just look at it's tiny little bridge! the 808 is alright for general knock around use, it's low fuss and not too bad overall. I will continue to use it until it runs out of supplies. Yeah, I'm definately in the 801 camp now....