Qubes is great. I am really pleased with it. Easy to build from source. And a decently secure hypervisor. I would like to see the Qubes specific code written in a memory safe language. The hypervisor of course would benefit. Otherwise I think it is almost perfect. It is fast, and secures USB devices. It even sections off malicious network drivers. I am currently running it. A few driver issues, but nothing to abnormal.