I just bought a 4th Generation G19. It conceals well enough in a Dale Fricke Archangel, worn at the appendix position., but all-day comfort is, well, maybe I just need to get used to it, and/or try it closer to 0300, and perhaps at 1000-1100, as a front crossdraw. Some rigs become OK with a little carry time. (Front crossdraw would be for second-gun carry.)
Another rig I am about to try with it is a Desbiens AIWB rig, that, tentatively, seems more comfortable than the Archangel at AIWB, but perhaps a bit less concealable. I have the advantage of carrying on my badge, rather than CHL, so true, deep concealment is less
vital.
I do plan to add a G26 soon. This will complete my trio of G17, G19, and G26. I usually carry the G17 as "primary" when not at work. At work, .40 or .45 are the mandated duty cartridges, and I still use my P229R DAK, but my ailing hand and wrist are painfully affected by .40 recoil, so I am starting to acquire gentler-recoiling pistols for personal carry, and for back-up at work. It remains to be seen whether the G19 or a G26 will become my concealed at-work hide-out gun.
Regarding the G17, I have been carrying it concealed in a Raven Concealment Systems Phantom, an excellent rig for outside the pants.