The TR7 for the USP is extremely nice. I originally got it because CT didn't make one for the USP full size. But having got it, the fit and finish is every bit as good as CT, surprisingly so having tried some generic eBay lasers. You can also squeeze the grip however hard you can and have no fear you're going to ruin the on button, because there is no "on" button (works by light touch and conductivity, not pressure, above the middle finger.) I think that aspect will prove helpful for recoil control, as I try to squeeze that grip pretty firmly. Can't speak to its long term reliability as I haven't shot that gun much since I put it on, but so far so good.
For the TR4 and Shield, I sent a shell back into Alien Gear to swap for a Shield/CT version and will mold that one with a little heat to accept the TR4 (very similar to start). I did this to an Alien Gear shell meant for the USP without a laser, and now the TR7 mounted to the USP works fine. If that isn't great, I'll look elsewhere or try and do a simple Kydex one myself, as a project.
I ordered the TR4 throught Optics Planet on Labor Day with a 10% off coupon, for under $100 shipped (not here yet though.)