Cal Audio Labs Icon MK II

So I've had this player for about 7 years, and really like it. Does anyone out there have advice about the "power boss" upgrade? Is it worth it? I'm not really interested in HDCD at this point; can the upgrade be done without the HDCD for less $$$? I tried to contact the website for CAL, but it's a little strange...seems some central access site for lots of companies?? Maybe I'll have to phone. Thanks. PS I have cj premiere 11, AI L1, Theil 1.5's, can't remember the cables. Thanks again.