I'm in the market for a new bc. Now obviously I'd want to try it in at least a swimming pool before handing over the money, but let's suppose for a moment that I couldn't for some reason. For a new OW student buying gear before their class, this might be reality, not hypothetical. What should I look for to have an idea if the bc is going to work well for me in the water? Is there anything that should make me put the bc back on the rack and not give it a trial dive, even though it fits on land?