I'd have to argue and say that it's different, not necessarily better. It just depends what you're looking for.
Having said that, I only use rebuilt coils in my ProTanks, I haven't attempted that in the Aspires yet.
Yes and no. There's some VERY interesting stuff being done with the protanks (cotton wick, nano coils, chimney coils, diamond coils) that can make for some impressive performance.
I rebuilt my protank after messing with the RSST a bit. Built a perfect coil and the PT2 worked flawlessly with it. But I would never compare it to an actual RBA. Drawing from a bottom fed clearo just isn't as good as my RSST.