This is my honest review:
I purchased 4 sites about a month ago. Out of the 4, 2 are duds, meaning they aren't easy to rank up ( stuck in in the 100-200 google rank). Another site is in and out of 15-30 google rank, and probably can get that one to the top 10. The first site I got is doing the best the highest rank has been 3, and has been on the first page for 2 weeks. The last site makes about $0.50-$5/day, depends on the rank on the page for that day.
The sites he makes are decent and definitely good SEO on the pages, but keywords are so-so. The articles also had to be revised as it was obvious no English native speaker wrote them.
Overall, decent sites for the price and If I can get my revenue up I'll come back to reinvest my profits.