What advice do you have for others considering NetXMS?

I would suggest using any hypervisor. We use Citrix Xen, which is also open-source or any other device with enough CPU and memory. Specific requirements aren't necessary; we just need processing power and memory. Overall, I'd rate it a ten out of ten. It's free, and it gives us everything we need. It provides detailed information and is as suitable as a commercial product, which is good.