For me, having the backups is the #1 reason to keep WHS. The file sharing capabilities is #2. And the overall peace of mind is probably #3. My WHS has given me few problems, almost, but not quite a forgotten piece of hardware/software. It's always worked
when needed.
I will probably not try Vail as #1, I don't have any 64bit hardware not in use and #2, the file system scares me off, and #3, if it ain't broke, don't fix it!!
Cruise