I have two of the stainless CCF Race Frames. One is a 9x19 full-house Robar Alloy Extreme finished in NP3. It might be the softest shooting 9mm ever. It definitely has the best Glock trigger I have ever experienced. The reduced grip frame width is really a plus for my short fingers. The gun is reliable, and I change the slide buffer when I change the recoil spring at every 3,000 rounds. I like it, but I essentially traded a gun I could not stand (a Baer 9x19 Monolith Heavy) for it. So I sunk no money into it, and it got the cursed Baer out of my hands. For that reason alone, I like the Alloy Extreme.
The other one I am setting up to be a suppressor platform, and you can see that the CCF product is essentially unfinished when compared to the Robar gun. I will probably send the bare frame off to Robar to get their "detailed" finish package with NP3 as I cannot keep the frame from rusting while just sitting in my safe. CCF did not do a great job of passivizing the stainless alloy.
I think CCF had a good idea but their execution was weak. Messing with the lock block design was a huge (and their biggest) mistake as it required aftermarket barrels to be fit to the gun.