I'm not very sure about that. It certainly worked, but Xen lost a LOT of market to KVM, to the point they open sourced the whole thing (maybe a little too late?

I'm not very sure about that. It certainly worked, but Xen lost a LOT of market to KVM, to the point they open sourced the whole thing (maybe a little too late?) in order to slow down the fall. At least this is my impression. At the end of the day I do like Xen and Citrix, they were/are certainly good for virtualisation on linux.