I've had a Grizzly piston, a Phase II piston, a Phase II wedge, an Aloris wedge and finally a Dorian wedge QCTP. I felt the wedge was better than the piston, then it gets murky, when it comes to the wedge type, is the Dorian better than the Aloris?, is the Aloris better than the Phase II? From the fit and finish, yes to both of those questions. The Dorian looks like a piece of art (quality issues seem to vary at times), The Aloris is nice, but compared to the other 2, the Phase II is a little crude, rough edges and uneven finish. But in operation, I noticed no difference between any of the 3 wedge types, in operation. They all work flawlessly. I switched to the Aloris, from the Phase II, because the Aloris was a gift, I switched from the Aloris to the Dorian about 3 years later, because of a written review, describing the difference in the operation in the wedge mechanism, yes it looks different (supposed quicker in operation, much less lever movement), but in operation I see no real difference. Maybe I'm not pushing the work hard enough, I am somewhat disappointed, I spent the boat-load of money on the Dorian, with no real gain in operational performance.
I have tool blocks from Dorian, Aloris, Phase II, many from CDCO and unknown brands, bought off the web, never had an issue, they all worked, some required the lever to me moved a little further, but still workable. I have a lantern post for the 14x40 Jet, ensured it worked, boxed it up and haven't had any reason to use it, to me, the installation of a QCTP, was one of the best thing I ever did in the shop.