I’ve been using the end vice on my newish bench for a couple of months. I’m delighted with it but it could have been easier to build.
The construction was ludicrously complicated. I used massive dovetails at the front and back of the bench to hold the end cap on. I don’t think I needed to; three beefy draw bore pegs through a clamped (breadboard) end would have been sufficient and cut the construction time down.
The vice screws were a very good price but I couldn’t get them with square section nuts so there is a bit of dust trap at the end.
I’m working on some drawings; they’re getting complicated.