Smooth, clean and expensive sound.
When I first demoed it, it wasn't as shiny and in-your-face as SSL, but once I started using it on many tracks, suddenly, everything fell into place with the slightest effort, much better than with SSL. The EQ and compressor are so spot on that it's hard to go wrong with them. Also, you can achieve some coloration with the preamp if you want. Smooth and warm but also clean, the 88RS always sounds expensive. It has probably the most expensive sound from the UAD library.