I have a couple other programs that do the same thing that this widget does (X Resource Graph and Menu Meters). Both of those apps indicate the same CPU usage for both of my processors, but this app gives completely different numbers. Since the other 2 match and this one doesn't, I must assume that iStat Pro is displaying incorrect data as far as the CPU usage is concerned. The other data that iStat Pro generates seems to be consistent with these other programs, so the problem appears to be related only to CPU usage (and possibly only a problem on multi-CPU systems, since the previous review noted the same issue).