Well I went on a Professional Power Plate machine today.

[thegirlonadolphin]

It felt extremely weird and I am not sure I liked it but 4 hours later I feel that really good exhausted feeling you get after a great work out. So on the whole I think they must be pretty effective.

I have one and although I haven't used it for a year, my DH told me to get it out and use it (not because he's saying I'm fat but because it cost a lot and he's p*** that it's stuck in the garage!

I always looked more slender afterwards - I mostly used it on the intense fat burn setting.
Only downside was that I lost all sensation in my big toes for 6 months. They're fine now but I'm putting it down to the machine, however, I was wearing mules during the summer so I may have been holding them on with my big toes.