The string hole shape is slightly different from OEM to Allparts, otherwise functionally identical. Supposedly better castings on the OEM bridges, though I’ve had an Allparts on my Ric clone build for going on 5 years with no sign of tail lift, so I think the negative association you hear about Allparts bridge is just sour grapes from Rickenbacker. I don’t know the history of how Allparts managed to reproduce this part without getting sued, but it’s been on the market for years. Having finally abandoned the V1 for the V2 design, kinda tough for Ric to argue the V1 was a superior design. At 1/3 the price of an OEM V1, if mine ever lifts, I can buy two more and still make out ok, but it seems plenty solid. It’s a very faithful reproduction, flaws and all.