Just upgraded to 3.1 (from version 1.x). Important notes:
Used an Intel PC (I've read there may be problems with AMD chipsets and USB ports, but I couldn't test that) with Windows 8 (using this trick to get Neato Updater 2.0 to install properly: http://capirgotech.wordpress.com/2013/0 ... windows-8/
Had to *disconnect* my router and use a direct Ethernet connection to the computer from the cable modem.
I used Firefox.
It went flawlessly, and quickly (just a couple of minutes) when nothing else worked. I spent probably four hours on this to get this going. Please, Neato: add these tips to your updater website at least, to minimize the grief of your proud Neato owners? We're a tech-savvy bunch here, but most consumers really aren't.
Glad to add my 2 cents' worth on this very vexing problem...