So far, I have not found anything that would help me decide on whether the are a wise investment.
One could probably use them as host cache devices but I don't think that that would be using their full potential.
It appears that FusioIO is still a more complete solution to IO accelleration fro VMware.
I have started a discussion on the Dell website too, here is the link to it:
http://en.community.dell.com/support-forums/servers/f/956/p/19500736/20339790.aspx#20339790
and there it is stated that it is officially not supported.
I was actually hoping for a development since it is not a new product.