ive been using there GHS service since i started mining through there pools, half the bitcoin i earn i buy GHS with otherhalf either is put away or converted to usd then delt with accordingly, ive had no such issues, although at random ill double in hash for a moment (10 mins) then go back but nothing that is affecting anything for me. So not sure your frustrations or anything because ive had no issues for over a month
Same as 713kaos for me mostly, I have been using CEX.IO for a while now, and the GHS worker speed can move around a bit, but the payouts are normal and regular, so it is easy to reinvest. Maintenance is linked to luck and lots of other factors, it has been high some days, lower on other. CEX.IO support has said they are working to lower their maintenance costs also, makes sense for any cloud mining to do this. Advantage of exchange and trading, good pool and support is worth the maintenance fee costs in my mind.