So a couple of months ago, I got a custom IWB holster from Corso Concealment; I wanted soft loops, FBI cant, slightly deeper than normal ride, TLR-1 light bearing compatible. Couldn't find that exact configuration anywhere, so I exchanged a few texts with Matt at Corso, and a week later, my holster shows up, exactly as I spec'd it out. Been wearing it since, and love it.
I always carry a spare mag and hand held light as well though, and haven't been happy with the combo carriers that I've found. A chunk of that is I wear either a Volund or Ares belt, both of which are a pain to thread through most gear, and part of it is my affinity for the Klarus as opposed to a surefire or streamlight. Limits choices. So, started texting Matt again. Mailed my light off to him, and *poof*, my perfect combo carrier shows up. Much like the holster it's easy to don and doff, secure on the belt, with a positive 'click' when mag or light is inserted, great retention but easy draw.
I'm a happy camper with both.