1) Basically, yes, it's mostly about looks. Having gone through several Aquaero's, I can say that the VFD has no diagonal viewing distortion. This means you can clearly read the VFD from any angle. Also the VFD seems to be brighter/easier to read. If that's worth the price...so be it.
2) No clue.
3) Not that I can see as of yet. My biggest gripe is that I've still not been able to flash my Aquastream XT to the most current firmware. This is a problem shared by a lot of folks, across (seemingly) many different OS's. Also, the Aquaero network feature has never worked right (I've never seen any network traffic generated from the software). This, also, was a problem on many platforms. Overall, I've found NO issues with the Aquasuite and Vista 64.