a week ago me and my business partner Daniel decided to test out PlugRush to see can websites of "mortal" people make money with it and most of all >> does it impact rankings?
In short:
1) there are no significant loss on rankings
2) Traffic-wise plugrush showed less than 1/3 of the traffic
3) the income is quite... well ;) read it yourself:
http://www.lustjobs.com/plugrush-review/ (full review, screenshots, impact on the rankings, revenue report and some other thoughts).
Have a productive day,
Helmuts