| I've got both Apeks TX40 and TX00. The differences between the first stages are purely cosmetic - the internal are identical. The differences in the second stage are even less than that - I breathe the 40 and keep the 100 as backup, purely because it's more de-tunable and the performance is identical.
Other than the cracking resistance knob, there's no real difference in any of the Apeks range. I wouldn't buy a 100 again - it's not worth going higher than a 50.
Why not start with Nitrox right from the word go? It's a better gas than air..
__________________ Life is like being immersed in water - it feels good, but the longer it lasts, the more wrinkled you get |