I put one on my Wildkat with a bigsby, and the change made a big difference in tuning stability. The one I got (on ebay) looks like a Wilkinson, with adjustable saddles, and is well-made and hefty, though it is not marked Wilkinson anywhere. I read one person's opinion when researching that they 'suck tone', but I certainly did not notice that. It was pretty easy to install - I think that I had to do a tiny bit of filing to get it to fit in place in one place where it was tight.
"GAS never sleeps" - Gil Janus
"Now you got to pay your dues. Get that axe and play the blues." - Spudman
Gear: Epiphone Sheraton II, Epiphone Wildkat, Epiphone Emperor Joe Pass, Fender MIM Strat, Tacoma DR-14, Johnson JR-200 resonator; Fender Super Champ XD amp