Ive had my M1 for about 4 months now. Have about 30 dives on it. I love it. Most of my dives are in the pacific ocean near Monterey, Ca, but I also just got back from the carribean. It breaths as easy at 20' as it does at 145'. Bubble interference is very minimal, and its pretty streamlined. It never freeflowed on me, even if I forgot to turn in the adjuster on the second stage (which they recommend when your on the surface of the water)The only thing that I kind of regret getting is the swivel on the 2nd stage. I didn't have any problems with it wanting to pull away from my mouth, but sometimes when your looking around you can tell you would benefit from a swivel. I cant say anything bad about it at all. Of coure, prior to my M1 I was using rental gear, and it was mostly junk, so I cant give you any comparisons against any other high end regs. I was also looking at the scubab pro mk25/s650, but it wasnt out yet and I kind of had my mind made up on a Atomic anyway. They sure look similiar (in case you didnt know, atomic was started with some guys that left scubapro) Hope this helps.