I have all three: Boge Rev, VMod and Reo:
Boge Rev: Got this for an extremely good price during the Black Friday sale from EliteVaporworks. I wanted to try a bottom feeder and it was an inexpensive way to do so. For what it is, and for the price I think it's great. Battery lasts all day, juice lasts forever. Sometimes you see one for a good price in classifieds. If you do, pick one up. I've been using it almost daily since Nov and it's going strong and battery hasn't dropped off.
neg: once the battery dies, that's it. The draw was a little tight but a member gave me a tip to file the slots where you put the carto with a dremel and that helped a lot. Been using it since I got it and it's great.
VMOD: Purchased for someone and they are very happy with it. Nice size, nice looking, vapes great. I wasn't aware that it had proprietary carts/attys when I got it. I've read they can be modded.
neg: Proprietary cats/atty- not sure it's the case with all models or not. You're going to have to purchase batteries and a charger if you get the basic kit.
REO: It's great of course. As far as use and performance, I can't think of anything bad to say. If I had so say a negative, it'd be the price if you wanted something that costs less. Also need to purchase charger and batteries.
To be honest, I like them all. If money is no object, get a Reo. Want a cheap bottom feeder the Boge is great. Mid-price, the VMOD is very, very nice. There are other bottom feeders out there, but these are the three I've tried.