I have been in IT for 20 years and have worked with ESXi for a fair amount of that time then recently started looking into open source alternatives. I have tried using Xen in the past (4 years ago) with mixed results. I have more recently also tried UNRAID which worked quite well however there is no real commercial support due to the nature of the product being more domestic. Then by chance I was skimming through youtube and came accross a video of XCP-ng (2 months ago) I have now transferred all of my infrastructure over and am currently looking at transferring all my customers with ESXi over as well. This is a great product keep up the good work.