I am a very experienced programmer who just started using Parallels Desktop for Mac; I decided to try it after deciding to change from WinXP, which I was running via VMware Fusion 2 using a Boot Camp partition, to Windows 7.  In fact I'm still on a trial license of Desktop 6.  It's using an entirely new VM with Windows 7 installed from scratch, not the Boot Camp partition.
I've been using 6.0.11992 for only four days, but on the whole it's been a positive experience.
I'm posting this not to gainsay ChristophL's report, but merely to add another data point.
I did have one significant problem, which has been reported elsewhere on this forum:  the prl_vm_app process slowly but relentlessly increasing its CPU and real RAM usage.  About 36 hours ago I changed the number of CPUs in Configure::General from 1 to 2, and haven't experienced that problem since.  We'll see...
MacBook Pro3,1 (late 2007); OS X 10.5.8
vm: Windows 7 Home Premium 64-bit
					 
				
			
			
			
		 
		
		
		
			
			
				Last edited: Dec 30, 2010