I'd think that any car that has a blown clutch after 600 miles, no
matter how you drive it, wouldn't be fit for the purpose. You'd have
drive a car very very badly to get the clutch to blow that soon.
My C-Max is a year old, done 14,000 miles, and its clutch is biting a
bit high for my taste, but still works fine, and that's with my wife
driving it for quite a bit of the time, and she's not the worlds best
driver; plus we live in a very hilly area where the clutch gets a lot
of use.
The citroen Xsara I had previously was an ex-company car and its clutch was still
going strong at 120,000 miles, though the suspension and other bits of the car caused their fair share of problems before I got rid of it.
Glad to see you got it sorted though.
I've had to have some suspension bushes replaced on my C-Max and it was a hassle to get the dealer to do the job properly. Funnily enough they've gone bust now...