I got a MOTU 1248 over the holidays and love it so far. The convertors sound amazing and it's making it a pleasure to run my KPA through it. I found a nice little feature. The SPDIF on the 1248 has a sample rate converter built in so I don't need to set the 1248 to slave mode and can still connect the KPA via SPDIF to it. The only downside so far is that, for my system, I can't seem to get glitch free latency less than 10 ms. But then these are the first Windows USB drivers that MOTU has release so I'm optimistic.
Cheers,
jayson