I have used it once and wasn't impressed.
Got one downloaded copy birth cert. and it cost £5. I've found it's better to do the research from your own library and pay £8 for a copy after getting a ref. no. I felt I did not know how much I'd be spending on the site so didn't stay on too long.
In short, the site did not provide me with what I was looking for and had too many lists of places to contact.