What are the fees like here? I like to use PBmining but know I see that they've collapsed?
All are cheaper than buying rigs. Check 'em out here:
http://www.rigwarz.com/Bitcoin Cloud Services: has the best payout. It's daily and equivalent to btcguild or ghash for 1 THS... but not as good as NiceHash.
PB Mining: pays a bit less than Bitcoin Cloud Services. I will get my PB Mining weekly payout in about 8 hours. Then, I can tell you better if they have collapsed. I had no problem logging in to their site just now. I doubt that they have collapsed.
Cloud Mining.website: is very cheap to buy. It's payouts are lower than the other two. So, It will take me over 140 days to break even with it. But that's better than buying more S3s.
Re: Ponzis: There are always suspects and those who call everything a ponzi. As far as I'm concerned, who really knows for sure which site is actually a ponzi in the mining world. My heart even drops into my shoes when i buy from Bitmain (and i know they are one of the most trustworthy). Some are even calling GAW a Ponzi- lol!
Anyway, the best thing to do is to diversify. That way, if one is actually a Ponzi in about 5 months, then you haven't lost everything.