Wow! So it wasn't exactly how I imagined trying one out but it worked... I rented one today to try out on a dive. Went down, rented my gear, headed up to the river... got all geared up... soooo much easier than fumbling with a stupid jacket BCD... and it was so much more comfortable... so off into the water I went... I figured that the back inflate would push me onto my stomach... I floated back on my back no problem... so when it was time for the dive, I let the air out and away I went... as soon as I started going down, the weight disappeared and it was like there was nothing there, it was easier to move around in and felt soooooo natural. Anyways, a couple of minutes into the dive and it was too cold to continue (I thought I could brave it without my vest/hood)... but the couple of minutes I tried the BP/W out it was way better than anything I had ever tried... I think I'm sold... I still need to do a full dive in one but I was really happy with it... Oh and BTW it was a Halcyon Eclipse with the Stainless BP and the weighted STA... VERY NICE!