Just scored one from eBay for £62 which methinks is quite the result. Been thinking about replacing my GT-8 for a while and it looks to be smaller and more flexible.
I really enjoyed the one that I had. It's got some great sounds on it, especially the delays and modulations. I could never really get the reverbs to work for me but all the other sounds were cool. The amp modelling sounds pretty good if you need to run a DI too.
I'd advise buying a tap tempo footswitch as you can program all the time based effects on a patch to sync up and it's really cool.