I have 500ghs as a test in Pbmining and will see how it works out.. So far in the past 4 weeks I have got payouts on every sunday at 00:00 am. Just like they promised.
ROI will take a while still though
Also I am not defending pbmining here.. I see it as very suspicious but I like taking risks and testing.

and as a sort of comparison 400ghs on Cex.io. Which has its good sides of being able to sell the ghs off. In Pbmining you cant.