I have a 4GB 701 in black and it's fab. The best piece of techie kit I've bought in a decade.
I'm not a compulsive upgrader. It's mainly used as an internet radio so ironically, the new model without the forward facing speakers next to the screen might actually be a step backwards for me.
I also get 3 -3.25hours out of the battery (in WinXP with the wireless on), so the bigger screen clearly comes at a price.
I might look again in 18months or so when the new faster performing but lower power CPUs are avaiable. It's certainly crying-out for Intel's new atom along with an OLED screen. 7 or so hours would make this the perfect portable device.
It's interesting that they talk about the Psion series 5. In a way Psion created a tool so useful that it ultimately doomed itself as the usual conveyor-belt of consumer electronic updates didn't really apply. 15 hours on 2*AA was nothing to be sneezed at either. I'm tempted to dig mine out and see how long it'll go on a couple of new 2800mAh cells. Should top 20 I reckon.
It's worht noting that the review is actually wrong, the chassis is slightly bigger than the 700 series.