Hi Niel,
It seems that everybody who dives a lot, trimix and deeper/longer dives is switching over to a RB now. I ended up buying an SF2 back in December and sofar have done @60dives using 21/35 and 15/55 with it since then. Had a really great instructor that worked with me so I could get good with it. "Good is not good enough" , if my performance could not be used for the next training video it wasn't good enough. In the fall I'll do Level 3 and CCR Cave with someone who can award the certification without having to have SF2 show up on the card.
What RB are you using now Revo, JJ, Liberty, or SF2?
BTW, last night I finally closed my fillstation that I've had for the last 15 years, between RB and Internet Trimix divers, I was no longer covering the monthly rent. 6 people showed up for fills last night, and only one wanted nitrox - all the rest wanted air. I'm glad that I'm finally out of the filling business, and my last 9 tanks of He Ar and O2 are now only for my own personal use. I'll probably get 18 months of diving out of the Ar and He, much less out of the O2.
Give me a call and maybe we can finally do some dives together
+49 172 7137646
Mike