Good questions! I'v tried buzzcity about a year ago when I heard about it in an ebook and I was very impressed with their customer support, payment processing, targeting, requirements & CTR.
With that being said - I'v probably went through $500 - $1,000 on the platform with very minimal leads and not nearly enough to cover my expenses. I'm sure the platform is delivering legit traffic. It is very possible I was just not able to determine the correct offers and media advertisements associated with those offers. It was a bust for me...
Good luck!