I have one of the newer threaded tac sol units on my 17. I sent it back once due to my perceiving a flaw in the design. I have been told its not. Customer service was pretty good.
I received my item back and ran a few hundred rounds of CCI mini mags through it.
It is very picky on ammo and it really only likes round nose pushing 1200fps+. Forget the cheap stuff....jams jams jams.
The 15 round mags seem to work best with 10 rounds or less.....CCI minimags seem to be doing OK though.
I have read they have a 500 round break-in period. The unit does seem to be running better and better the more I shoot it.
I discovered that the notch in the slide was not cut all that well sometimes allowing it to not lock open on the last round a few times, and would release if I pretty much breathed on it.
I took a small file and cleaned up the notch.
In spite of all that, I am happy with my purchase. It will be a good trainer, plinker, and it is just as quiet to shoot suppressed as my Ruger 22/45.