Anyone using an Imac?

[owner]

Thinking about dipping a toe in the water with one of these.  Reservation is how they would run temperature-wise with CPU and hopefully GPU running24/7 .  Anybody got any experience?

[owner]

Thanks LawryB. 
Thought that the Mac pro machine would probably be the better choice.
Will do a price/performance check against some PC's before mking the final choice
It's for use in the UK as I have to go back for a couple of months, and the laptop's getting a bit tired these days