You don't get near as much depth with RFB as you do TMO. It's basically you can reach a certain mark and you're history. Once you pass it, you're gonna die, even if you get the boat going up. However, if you have no damage you can take it to the very mark and be perfectly fine, another foot...history. I use the S playing TMO 1.9 and do fine at 300 ft with no damage...but I wouldn't take it a foot further.
The Gato you can get down to 600ft without damage, but about impossible to hold depth unless you use a good bit of speed. I find 500ft controls well.
But rest assured, just a few damage points can change the ball game, so it's best not to push the deepest limits. You take damage that deep, you could easily die, why another 100ft shallower...you probably could get through it.
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