Wobbly, I haven't either, but I did do some research.
TuneBoy actuallyruns within your bikes EFI system, and has a myriad of configurations, or you can build your own if you run on a dyno. Expensive, and I'm not sure it's worth it for the small gains in HP. My old mechanic says, if you want your bike to go faster, by a faster bike.
PCIII attaches after the bikes onboard system, which means you are re-altering the actual parameters the original computer map puts out. Personally not my cuppa.
IMHO, if you had to get one, get the Aussie made TuneBoy. If it was me I'd forget either, I know others will have another opinion either way.
Mick