I haven't been in it for long, but the numbers are solid. For example the Dash difficulty has a steady pace so should remain very profitable for the extent of its contract. The real problem with cloudmining sites is that Bitcoin mining is not very profitable because of the nature of the coin itself and the fact that all BTC contracts include maintenance fees make the whole thing a bit of a gamble.

So for example I have a contract mining LTC - I paid $500 for it and it will mine me 17 Litecoins over the next year - maybe 15 with adjustjustments for difficulty, and next year it will provide say 12 again factored on difficulty increases - so 27 LTC for $500 not a bad deal