Nice, just fired up the Groove Jazz channel at work. HiFace SPDIF -> KECES DAC -> Diy tube preamp, Mackie MR5 active monitors and it sounds way better than I expected.
Watching the network usage it looks to send the file and buffer it in memory, so can't really get a good idea of bits/second.
Ah, found it on their site:
(5) We stream at 32 kbps, which makes for a good-sounding Internet radio station but is not quite a quality level that most consumers feel is a substitute for CD ownership.