Yes, you will be delighted with the performance of the improved Xen.
Have a look at the link and see a comparison between Xen and Vmware
http://http://itcomparison.com/Virtualization/Xenvsvi3/xenvsvmware3esx.htm
The CPU efficiency with the Xen is noteworthy. 8 processors are supported with a Xen server compared to only 4 with the VMware server.
Moreover, the Xen is cheaper than VMware.