My one gets very toasty inside, and I know Stu's does as well since I was warming myself through his open window at one of our green lane days over christmas.
The engine only takes about 2 miles to warm up as well.
Its gone a little bit cooler since I cleaned out my intercooler last weekend, as I lost a little coolent taking the top hose off to get the fan shroud out. I did not top up the water as only a little came out and the header tank was still up to the full marker.
I will be adding some more coolent tonight and the heater should be at full strength again.