I've had two BCA Float bags and now I'm running an Ortovox ABS Base 20.
The two BCA Float bags that I had were the Float 32 and the Throttle 22. Both are decent bags and both bags offered enough storage for what I needed to carry. In fact the 32 in my opinion was to big, and that was why I went with the Throttle 22.
I ended up selling the Throttle 22, as I had to send the bottle in twice as it would not hold air. I guess I started looking at it this way.....I'm paying for an insurance policy in a sense and with bottles that were not holding air, I wasn't the most pleased.
I did a bunch of research on the ABS bags and after riding with Dan Adams and talking avy bags, I began looking at the Ortovox ABS bags. I did a little more research and ended up getting the Base 20.
I only have one ride on this pack but I can tell you, I do like it better. It seems to fit me a little nicer and the pack is just a little more comfortable for me. Storage wise, the Ortovox Base 20 is a tick smaller than the Throttle 22 but I can still get what I need in it. Plus you don't over pack and end up with the kitchen sink on your back!!!
On the Ortovox ABS packs you can also completely remove what they call the M.A.S.S. unit, which is actually the air bag system. Now you have a nice regular back pack for any other time of the year.
As far as weight, the Base 20 is slightly heavier then the Throttle 22 but not by much. But, if the pack fits and feels better, that minute extra weight is not noticed, at least for me it wasn't . Hopefully in the near future ABS will offer the carbon fiber bottle in the US. Once they do, the weight will be obviously brought down some more.
The ABS bags are top quality and fit and finish is excellent. They also have a proven track record, which means a lot when considering the whole "insurance policy" aspect of it.
I actually did a review / write up on the Ortovox Base 20, if your looking for pics or more info.
Here's a link,
http://www.snowest.com/forum/showthread.php?t=392157
Ortovox avy bags,
http://www.ortovox.com/4496--all_avalanche_backpacks.html
I guess, when it comes right down to it, if your going to ride the backcountry, an avy pack is a great additional piece of equipment to keep you safe and able to keep coming back!!! So what ever you buy is better than not having one at all!!
Hope that helps some and if you have any other questions reference any of the bags mentioned, give me a shout.