I agree downside - for a tenner, it's well worth it. I've not been researching my family very long, so I'm still very much a beginner - and it was the first place I found where i could put my tree! Didn't know anything about all these all-singing, all-dancing programmes you can get! I have had quite a few contacts from people who have passed information to me - usually from 'side branches' but brilliant to have, none the less. I suppose it would be wonderful to find someone who has a direct direct link, but that might be asking too much!
I've found it very much a useful thing - and I tend to just rattle through the Hotmatches, getting rid, and keep them down to less than a page of 'possibles' - haven't got round to contacting all of them yet!