I am well satisfied with my Underwood mod to a Denon 2900. I do not have another player for side by side comparison, but I do believe that the sonics are better. Certainly the workmanship, evident by removing the cover, is top drawer. Apart from the sonics, dealing with Wally was no sweat, and the whole project including shipping both ways, took less than two weeks. I have heard horror stories about delays with other shops.
