I have the behind the seat water bottle holders. There's a picture of em posted in the 4th of july thread. I don't actually care to actively use them for drinking while I ride, usually they are just storage for backup bottles. When I come to a stop and am out of water in my frame bottle then I switch out the bottles so that I have a full one on my frame, which I find very easy to drink out of. The reasons I don't really like to use the ones behind my saddle to drink out of are: 1) the bottle holders are tight. I have a profile designs (I think?) Plastic one and its really hard to get a bottle in there. I've tried to stretch it out but it's always a struggle to get a bottle in and out of it. 2) It's an awkward position to reach around for, it entails sitting up pretty straight in the saddle and keeping one hand on the handlebar and then pulling hard with the other hand to get the bottle out. I'm pretty flexible so I find the frame bottle within easy reach for me though.