I have one - it's fab - I did start a thread on it when I bought mine!! I tend to use fat free yog, I will try to find my original thread and bump it for u!!
They are great - but agree with ukali - the tricky bit is remembering to put the bowl in the freezer - LOL
I think there are some great recipes on this site, very low syn too - hope the summer is going to be a good one after the L O N G winter we've had so I think it would be a great buy