Very comprehensive (says a fellow HHKP2Pro owner).
There is allegedly a Caps Lock - Fn + Tab is labelled as "Caps", and rumour has it that this is the case, but mine has never worked, simply returning a tab.
Although I am using it on a Mac, don't know if this makes any difference.
I have relatively large, strong hands, and although I rarely accidentally press a key, I do find that I can rattle off a quick sentence or two much more easily with the Topre switches.