Just a quick note - unless you know differently, the MyXerver is not available. I tried to buy one through Amazon after your excellent review but they kept delaying delivery before cancelling the order. Novatech did the same. According to google, it is not available anywhere and I'm not convinced it ever was - although they seem to have sent out plenty of review units. Just thought I'd mention it as you guys seem to refer to it fairly regularly.
The popcorn looks okay, but I'd far rather it could take a BluRay AND a 3.5". That way around, it would make a very versatile NAS, Media Player and BluRay all-in-one - and for similar money to buying all three separately. As it is, the 2.5" limits the storage making it no use as a NAS. Then it starts looking rather expensive.