I am confused, is that not what I said using the Halo and G260 for comparison and the Halo is quite a bit less expensive? No big deal, I agree, the Halcyon regs are a fine deal and in no way would I feel badly about owning them except I would probably sub in a vintage G250 cover
. It is certainly possible the H75 has been updated to Evo standards since I last looked one over. The H50 does not appear to be Evo as it does not have the same port arrangement as the Mark 17 Evo.
Changing subject a little. As to the demise of AL et al, well, I did try to order some parts through two LDS and they were unable to get the parts. They also told me they had great difficulty getting stock. I was able to get the needed parts through the usual source here on the board.
Hey, yes, you said they are less $. I quoted 3 of y'all at once. The other two said H is more expensive. I quoted you because of the statement that the H75P does not have EVO guts. I have not verified for myself. I was just TOLD that they are by a source that seemed very reliable. I.e. I *could* still be wrong.
I'm curious why such variety? My guess is that you took advantage of deals. Wouldn't any of these regs work just fine for any of these purposes? They're all great regs.
My thinking has been to have all my regs the same, to the extent possible, so I can swap things around, get them serviced at the same place (ideally, my own workbench), etc. Is my quest for uniformity silly?
Circumstances. No master plan.
I bought my Dive Rite XT1/XT2 regs when I first started tech diving. I wanted a dedicated set for doubles and they had a good reputation and were more affordable than other options.
Later, I was teaching at a shop where I could get ScubaPro at Key Man pricing (which made them VERY affordable). I had been constantly told (by the owners and other instructors at my shop) that the SP Mk25/G260 was the best breathing setup any of them had ever tried. Meanwhile, I went to SP Reg Tech training and they said their new S620Ti was their 2nd stage with the lowest WOB of breathing of all their regs. I wanted to try them and see for myself, so I bought a doubles set of each. I really preferred the G260, so I sold the S620Ti set to a student a while later. The DR regs became my deco cylinder regs.
Then I got access to a Huish dealer account. I'd read a lot of hype about Atomic regs and wanted to try them, to see how they compared to my SP regs. I bought a Z2 set for single tank and an M1 set for doubles. They were/are all awesome. And very affordable, compared to the ScubaPro regs. I only sold the Z2 set because I rarely dive single tank, except for teaching OW classes. And, now, I'm teaching for a shop that sells Halcyon but does not sell Huish stuff. So, I sold the Z2 set and bought a Halcyon set, just to be wearing what my shop sells when I'm teaching. I actually liked the Atomic Z2 set a lot better than I like my H75P/Halo set. I've had nothing but trouble with crap breathing on my Halcyon regs.
Most recently, I got back into diving sidemount. Mainly because I've got a shoulder that needs replacing, which makes me unable to reach the left post on my doubles. I still dive my doubles for some stuff, so I wanted another set of regs dedicated to sidemount. My shop recently became a Dive Rite dealer and we bought a couple of Choptimas. I was at Dive Rite HQ doing my crossover training on my Choptima and also wanted to try the new Dive Rite XT1/XT4 regs to see how they compare to all my others. So, I bought a set in their sidemount package config to use with my SM rig for OC SM and for when I'm diving the Chop.
Keeping them all dedicated to a specific purpose (e.g. BM doubles, or SM) and needing 3 bail out/deco regs for some dives means I really only currently have 1 "extra" reg - which is good to have as a ready spare. I was changing them around as needed for different purposes. But, it kept happening that I'd go to use something and the hoses were the wrong length or in the wrong ports or I was missing a hose or a port plug. I hate that kind of thing. I'm very fortunate to be able to afford it right now, so having a bunch of regs, each dedicated to a specific purpose just "works" for me.
Getting my own personal experience with so many different options, so I can formulate my own opinions is just a bonus.
Also, regarding Atomic and their environmental sealing and "messy" refills during service: I've had mine for 3 or 4 years now (can't remember for sure, but I think 4). I haven't needed to service them yet. When I do eventually service them, I am okay with one messy session and a few bucks to get them back to like new performance. It's worth it to me, versus the extra time and effort the Mk25/H75P need for post-ocean soaking/rinsing.
), I'm trying to understand which ecosystem I should focus on. Especially if I try to service my gear, sticking to one manufacturer alone would make my life easier. 
