XO is currently under development and contains various known bugs/limitations.
We will try to list the most important here so that you know what to expect if you try it and that we are planning to fix them :)
You can't currently modify disks and networks on a VM. Will be fixed as soon as we can.
Our error messages aren't really explicit. We need to fix that.
Due to the non-atomic process of VM creation in XAPI, if it fails, you'll have a template created with the name of the VM in your template list.
But now, global RAM count is "fixed". We need to find why it doesn't work.
We need to create a VNC proxy in XO-server. Planned.