Welcome upgrade
I have the Gen 1 ReadyNAS duo and while I've wanted to love the device a lot (it is super cool in lots of ways) the processor performance was always a let down. The built-in web server control panel is painfully slow at times and could not handle a situation where a DivX movie was being streamed to a TV for example, and files saved to the device at the same time.
The switch to ARM thankfully enables 3TB drives which was another let down on the SPARC architecture (where it was limited to 2TB).
Overall this takes the unit to being 'great' in my view. Annoying that I now have to buy a new one.