Congrats on your successful double event! Especially neat to hear that they favored the VCR2 as the easiest breather! It looks like the other regs you had for them to try are no slouches either... Nemrod Snark III for sure. NE Divers/Sportsways I haven't tried. Mistrals and DA Aqua Masters. A very nice selection for your divers to try out.
The Freedom and Simplicity of Vintage Equipment and
Vintage Diving Technique are Why I Got Back Into Diving.