I've used these a few times on guitars now, Their main benefits are the easy re-stringing compared to many wraparounds, and the concealed posts don't snag your right hand. They are half the price of many other bridges, but of equivalent quality. There's a good range of adjustment. I can't comment on using them as a retro-fit as I have only used them on new builds. I've only docked them a star because I think some others are a little prettier!