I have a set that's waiting to go on the current guitar I'm building. I don't have experience with them in use on a finished guitar yet, but I can tell you the threaded bushing design looks identical to that of the closed-back M6 type Gotoh tuners (which I like) that I've been using for a while. The only difference I see in the dimensions important for installation of the open-backed tuners versus the M6 tuners is the distance from the string hole in the post to the base of the tuner plate on the back of the headstock which is shorter by 0.2 mm. If you have used other Gotoh tuners with the threaded bushings it would be good to check to see how the dimensions compare to what you are used to to avoid any surprises. Gotoh has schematic diagrams of their tuners with dimensions on their web site.

I've also got a set waiting for a guitar. They look pretty good, I've been using the closed back Grovers with the threaded bushings, I don't much care for the press fit type.
I ordered mine from Japan, it does take a while to get them.