Mine works well. Has a locating screw on the back face of the recoil lug and a grub screw through the receiver into the barrel thread (hole drilled into the barrel thread) to prevent the barrel tightening up.
It takes me about 1 minute to break the rifle down to its basic components, the only tool I use for the swap is an allen key for the grub screw, thats it. The recoil lug pin is a simple locator, it simply sits in a recess, very simple.
The bigger problem is bedding. You will need a barrel of the same contour as the one you are using for optimum bedding at the knox (first inch of the barrel). You need a smith that is patient enough to fiddle around with the light finishing cuts needed. Apart from that, its not rocket science, just patience.
As for calibers, you probably do need to stick with the magnums to avoid bolt hassles. The choices are pretty good though, .257WBY, .264 Win mag, 7mm Rem mag- all light recoilers etc.
I put some clips of my switch barrel in action, fitted with its .375RUM barrel. The clips are short but its probably best to skip the part 1 intro clip. Here is a link to part two. I think I broke it down into 5 parts.
YouTube - Shooting the 375 RUM part 2