Have a SIRT like my pistol, with a cheap eBay chinamart RDS even, right on my desk. When bored, go do drills.
Have a SIRT bolt for the carbine. I use it less, because of the changeout time. Vague plan to make me a dedicated trainer sometime. On the list for a 3D printer friend is him modding a printed lower to be a not-gun for safety, and legal things (run a short barrel, etc).
I have seen, but do not use, the targets. No issues just seeing where I hit, correcting. I don't do it for trigger control as much as gun control. Use it to clear the house and work on movement, angles, sighting, etc. Go do something like shoot all light switches. Or, set targets around the house, find them. When driving I also bring it on trips, do the same in hotel rooms. Aside from safety (and recocking!) it clicks a lot less than a real gun.
Anyway, love and highly suggest the SIRT. I have some snap cap lasers also: Meh.