UCD modules in amps like the Channel Island D-200 are slightly improved over the ICE module. (High frequency response is not sensitive to speaker impedance). The TriPath module, used in the CarverPro ZR1600 amp gives nothing away to UCD or ICE. (I have both models of amp).
Unlike the ICE module, the UCD modules and appropriate power supplies and even a wiring harness are sold to consumers. You can easily build a superb amp for less than a grand.