I'm still confused by what is "legally" allowed by the Trimix certifications though:
Advanced Nitrox + Deco Procedures = Can go to 45m but only with nitrox, no helium
Advanced Nitrox + Deco Procedures + Extended range = Can go to 55m but only with nitrox, no helium
Advanced Nitrox + Deco Procedures + Trimix = Can go to 45m with nitrox OR up to 60m but only with with helium ? (i.e. 50-55m on Nitrox not allowed?)
Well there is no scuba police, the limits are just for training. So you can typically do whatever you want if the operator is ok with it.
My personal limits:
Nitrox 30-40 meters depending on the nature of the dive.
21/35 - 50 meters
18/45 - 60 meters
Deeper than that, and my wallet would kill me if I did it OC.