I've no hate for the Atomics, actually I like them. I've had a B2 (sealed) and an ST1 for a few years - they were the first regs I bought. But I know now I paid more than I needed to for my first reg sets (the MK11+R370 would be what I would have gone with first off if I had known better, or the APEKS XL4+) at a little more than half the price of the Atomics... But the shop said "When you're 'deep down you want the best'. And the Atomics, well they the best they is".
I've a drawer full of MK17s, MK11s, an MK11t, a few H50-Ds and HOGs. The Atomics don't get used anymore. I have seen MK19s and really would have ZERO interest in having one. They are just too bulky. The MK19 might be a deal if it were half the price. But still too big. As the H50-D is still available and the MK11s as new, I would never see a need for the MK19. I really have no great lust for a turret. My current favorite is an MK11/MK17/H50-D paired with an Apeks XL4 second.
On the upcoming trip to Roatan I intend to go back to the G260 and see if I like it any better than I first did, since swapping the mouthpiece out for an APEKS comfy-nibbler. Maybe get a decision on the long-term position of the G260 in the lineup: In use or on the shelf with the Atomics.
I do all my own servicing. Don't trust the Atomic packing tool so hand packing is the way to go. (I don't trust wheel bearing packers either, so I still manually smush grease into those in the palm of my hand. Maybe just my thing.)
At the end of the day, I prefer diaphragm regs over pistons. If I were to do pistons (and I'd probably be perfectly happy), I think I'd go MK2. To each him's own though. There ya go.