Paul,
I was the original guinea pig that asked Wayne to take a look at the Tripath, so the fact that I ended up with a battery-powered amp at all was a pleasant surprise! I have a single set of Bybees on the inputs (I have bybees on my speakers so I didn't feel the need for another set on the outputs). I thought about adding them to the power supply but at that time I didn't even know if I would like the amp that much so I held off spending any more. The fundamantal sound of the battery-powered Tripath is so good, I wouldn't sweat the details on upgrades too much.
dstroot, I completely agree. I would only say that if you get the chance, listen to bybees in a removeable configuration and decide for yourself. I agree the explanation of how they work is beyond vague (I have degrees in physics and math so I'm not easily sold with psuedo-science either). I happen to think they improve inner detail and reduce glare based on my personal experience with them (Cyrotweaks speaker-level bybees). I went on that experience when ordering them for the amp.