Si has one, i think unless you get really good and slick at using it, can use it lots and not make it into a gimmick, and not make it the one off highlight of your set, and not go over the top with it. then its a great little thing. But KT Tunstall is very good at using them, so if you cant do it better than her or differently then i would think you run the risk of looking a bit second rate.
Zoe Mead uses one, and hadnt quite mastered it when i saw her at the vic some time ago and it struck me as a bit of a "what can i take from other middle of the road singer songwriters that ive seen" scenario, and as such left me decidedly unimpressed. Tunstall blew me away when i first saw her using it, cos she puts her vocals and rythms and over dubs through it and by the end she has a whole band playing there (sonically).
ultimately, personally, i think it would be something that you'd use for a bit, have lots of bedroom fun with, perhaps take out for one or two gigs, but end up getting rid of.
like a good looking girl with no personality.
