I've been poking along with this for ~1 week. I've not found any "oops's" yet.
I have my system running along ok. Mine is running on my laptop, as a VM in SUN-VirtualBox. I just couldn't get it to go in VMware Player, and VMware Workstation was a "pain" ... WE have a Vspheare environment, but I'm not ready to take it there. So VirtualBox is doing it's thing.
I have a Dual Core 1.8 w/ 3gb ram on Vista-32 Pro. It really is keeping the PC in a nice VM environment. CPU ~50's% and RAM ~70's%
I have Office, and 4-5 browser windows, and ~6-8 RDP sessions going at a time.
I have 6 clients I'm pointing at Nagiosxi right now. It keeps the server/services @ ~ 1-10% ..
IDK what else, but I am working w/ the Nagios "Guys" when I do have a question, and that's going great.
JLH