I've owned a W4S STI-500 for a bit more than two years, which I purchased to drive a pair of power hungry Totem Mani-2s. I've switched to driving them with tubes, currently Rogue M-180s. I decided for the while not to sell the W4S, but to use it as a backup should, or should I say when, the primary equipment needs to be sent off for servicing. I very much like the crystalline (detailed) highs the 500 lays out and also how well and defined it controls the bass. The positive ink it has garnered is, I think, well deserved. Although it lacks a phonostage, it's a very nice integrated which I can easily recommend. It doesn't have the sonic qualities of tubes which I prefer, but in its price range what does? So, while I may have moved on, it has stayed put.
Jerry
Jerry