There were definitely positive things about it.. all linux, virtualization and I even liked the way they are able to empower the user by providing that interface. I did not like that you still require mutare message mirror, I did not like that you can't use your own SAN storage, the physical requirement for One-X Speech, there is no presence based routing (Lync, Outlook calendar).
It would definitely suffice for what we currently have today as it does the same things, but there is really no UC type integration/mobility. I'm sure they'll get there, but some others I've seen have these types of things native in them.
Not saying it wasn't something we are considering as I'm sure from a pricing perspective it will probably be cheaper, but I expected a little more.