Hi Sorento
My Sorie has been with us from new and at 97k miles is still on the original clutch.
We tow a heavy TA and always use the Low Ratio gears for manoeuvering. No clutch burning smells
£850 is not a bad price if they changed all the clutch bits including the, driven plate , diaphragm spring plate, hydraulic slave cylinder and the Dual Mass Flywheel.
Have a look at Uksorento
http://kiasorento.proboards.com/index.cgi
Clutches are strange things and normally wear out prematurely because of misuse. 60k isn't to bad but it could be better.
Never use the clutch pedal as a footrest.
Never ride the clutch on a slope , select neutral and use the handbrake.
Don't sit stationary , in gear waiting for the lights to change. All these things wear the clutch parts out.
And I'm not for one minute saying you do any of these naughty things!!
When we had a non fixed bed unit I left the cushions as was , covered them with a thick feather undermatress , sherets and duvet.
We never had any sweat stains. That is what can happen.