Looks interesting, will do a small article about this service in a few hours 
IT is like CEX.io your price in KHs can only go down over time.ROI jumps +50% with upcoming/existing Asics and forget about return
.Eg for price 3500Khs i would prefer buy Direct 5 BTC than Khs than 3500$ for cloud mining ring +some maintenance fees.
Then wait 3-4 moths till they dump coin prices so much that you will buy them for ~80~90% discount
.Cool tool to dump ASIC(script) coins which are are out.
I wonder how many coins will with their POW to other algorithm Blake256,SH3,scrypt-jane,X11(Darkcoin).
I think its risky at current prices but good luck.
Everything in the cryptocoin world is risky. Betting on the new Asics is risky too and just buying and holding BTC is probably even more risky.
For the record, what you are doing at scrypt.cc is simply buying KHS for a return. The return is variable, but so far has been much higher than expected. I'm sure it will go down at some point, maybe even today. But I think it is a better use of BTC than just putting them in a paper wallet. I might lose, but everyday I have choice of, buying more KHS with my earned BTC, diversifying my earned BTC or even selling my KHS for what I can get that day.
However this site really isn't like CEX.io. CEX.io is very heavy on the trading side. There you can't really make much of a gain by just mining at the current prices, although that is a lot better than it was two months ago. The scrypt.cc business is much more about the mining than the trading. Same general concept but weighted very differently.
Another huge difference is a scrypt.cc they pay every 10 minutes like clockwork. That is really nice and removes a lot of the stress.