I had a little Creek integrated some years ago, I think maybe it was a 5050 model. 50-50 would describe its performance compared with the Nait I that replaced it; it was really about half the amp of the Nait in every respect except raw power. Maybe newer Creeks are better, but I remember that thing being harsh sounding.
Unless the new ones are considerably better, I wouldn't bother with these myself given that a second hand Nait can be had cheaply and can be fully serviced by Naim.