multi effects are no good - i'd rather reccommend getting a few choice boo-teek pedals that do the sounds you need.
well, with all respect not all people have the money to get those boutique units. I bought a Korg AX1500G a few years back and it cost roughly the price of the Teese wah I'm currently looking at buying.
Anyway, this isn't the time for a debate on the pro's/cons of multi fx versus boutique, we all know the things multi fx are good for. The Korg - which I believe has since been upgraded with a newer model, I believe - was OK. It covered a lot of ground. It was definitely quite easy to be creative with and had lots of space to store your patches in, and the interface was easy to work with. I really wasn't too keen on the distortions, though. Also, I would be wary of giving an opinion on the tone of it simply because my rig has changed so much since then - different amp, different guitar, different FX - hell I even write different music nowadays! So whilst at the time the Korg was fine for my needs I can't really give a good comparison of it compared to my current set up, so much has changed!
Anyway, I think Bill Frisell used the GT8 for a while, and he has great tone...
Hope that can be of some help, though.