I recently got my Certum Lux 2 for my 19 Gen5 MOS.
I like it a lot. It is comfortable at 3 o'clock or so position, my preferred spot. I don't like the T1 clips, at least at first impressions. Very stiff, which is good, but I dislike the bottom hook. It makes getting the holster on or off a bit more of a chore, at least for me. I don't have a lot of experience though, so who knows, once I get the technique right, it'll probably be a non-issue.
The quality of the holster speaks volumes compared to my Vedder LightTuck, which is also a good product. The Tenicor seems thoughtfully designed and crafted. It feels like a well-made product. The gun fits the holster perfectly, like it's impressive. I don't have qualms about the shorter sweat guard but I can understand the issue there. Being about to use a lot of WMLs on my gun and still have holster-compatibility is a major plus. That it's optic-ready by default (and not an upcharge like some brands) is a plus, too.
I think I still prefer my Vedder LightTuck at the moment, because I just know how to make it comfortable for me. But I think with use I will come to really like and prefer the Tenicor. Whenever I mount an optic to my 19, I will have to use it as my Vedder isn't optic-cut.
I also bought their Arx Lux OWB holster and Zero Belt. The Arx is probably my favorite holster of the two. Really sturdy, comfortable holster. Also impressively well-made. It will probably become my dedicated range and winter-carry holster. I am tempted to buy one for my 43X; I'm curious if I can conceal it with just a shirt.
The Zero belt has to be my favorite Tenicor product. It is incredible how comfortable yet study enough to carry even my 19. It is a night and day difference in comfort over my Kore Essentials. That belt was immediately resigned to range and class duty. I don't get hotspots with my Zero belt. With my 43X in its Vedder LightTuck, it is an incredibly comfortable way to carry. I highly recommend the belt, even if I haven't convinced you of the holsters.
Hopefully that helps - please ask if you have questions.