Slendertone belts, do they work?

[used2bthin]

I've searched old messages and some seem to say they do but does anyone use them still? Would they have the same effect as doing sit ups every day for example? And are they difficult to use or is that just the thigh and bum ones? I used to do an abs class where I used to live and have really noticed the difference since I stopped going. I'm going to try to go to the gym once a week, power walk/run once a week and have ordered some excercise dvds to do as often as I can but I find sit ups hard due to a neck/shoulder injury.

Mine works great but unfortunately I am too lazy to use it. I did use it religiously one spring before my holiday and I had amazingly toned tummy in all the photos. But that was when I was thin and only 18% body fat as compared to the blimp I am now. It still pulls your tummy muscles in though.