AKGunkie,
My (defective) Fulla arrived yesterday and I have tested it with my PC, Laptop, Surface Pro and Surface RT. My unit is suffering from the incorrectly implemented 48x oscillator, so I will need to revisit my tests when my new unit arrives. Here is what I found.
PC/Laptop - works without issue.
Surface Pro - works without issue.
Surface RT - NEEDS a POWERED USB hub. It will not initialize without a powered hub. I believe the RT's USB port is limited in power (as are many other low power devices) and apparently the Fulla draws too much power for it to operate properly. With a hub it works perfectly, though as another poster indicated, the USB hub introduced a ton of noise. Granted the hub I had was most likely a USB 1.0 version and was about 10 or more years old (score 1 for the junk drawer of remanded electronics). A modern, quality USB hub should be better at reducing the noise.
So, if as you indicated you are going to use it with a USB hub with a external drive, flash drive and the Fulla, as long as it has its own power supply, you should be just fine.
Hope this helps. When I receive my replacement unit I will give you an update whether it works without the hub or if it is still required. My hunch is that it will still need a hub to work with the RT, but I have been wrong many, many times before. Just ask my wife.
-Tim