Hmmm, they're grrat in principle, in my experience! Ours was one of the first pilot ones. They have always promised great groups and activiities but never delivered for some reason.
Initially you had to be in the local 'catchment' areas - specifically areas of social deprivation or a 'registered family' who got on their books via SALT or HV recommendation.
At that time, early on, they were hugely well-funded but the staff seemed clueless as to how to run the place. Our local GP's were not having their HV's replaced if they left, yet the surestart centre had them coming out of their ears and you couldn't access them unless you fit the criteria. I think that's changed now, thank goodness.
It does seem better now, but still somehow not up to expectation - things are often cancelled at the last minute and you ring up to go on a course and they say it's not now running. Also their literature is generally a bit crap - bad spelling, missing off dates or times etc.
I think it's a good idea and I'd like it to work, as it clearly does in so many areas, just not in mine unfortunately.