Yeah overall I am pleased. I came from a Coolermaster CM690 Dominator Pure which was a decent midrange case with good air cooling options. It is definately quieter than my previous case (but not by as much as I had hoped), even with a thermalright silver arrow at 90%, and four 120mm fans. It's not a great air cooling case and unless you have a very good CPU cooler your not going to get great temperatures at high overclocks. I would say it is worth the £70-80 but no more. Build quality average, perhaps slightly worse than the CM690 IMO which felt solid and sturdy where as the R3 can sometimes feel a little cheap.
Well at the moment I've got a coolermaster elite 335 which is a very cheap case. So the R3 should be alot better. I don't overclock. I'm running an i7-860 with a freezer 7 pro cooler and a reference design xfx 5850. So I don't think I need a massive airflow and the standard fans are supposed to be ok for what I need