They're not that tough.
I run my 2.1s at 25-30psi without any problem, but I'm only 10.5 stone. They do squirm more than some, and they wear out pretty fast.
But… they're very light and grip very nicely. My favourite all-purpose tyre.
Hmmm… I'm over 2 stone heavier so I'm not sure they'd suit. I usually run 2.25 snakeskin ralph on the rear that works well so could try one on the front but I'm not sure I've got enough skill for the lowered levels of grip from the minion I've got at the moment (you've seen me ride njee20 – it's not a pretty sight!).