Read the hashcows thread....They have tried a lot of coins and the most profitable don't behave well for various reasons when they throw the whole pool hash rate at them. I'm happy trusting them, the payouts I've had are well worth the non-hassle and risk of trying to keep up with a coin rating site. Also check out coinchoose, dustcoin, coinwarz....they all rate coins differently..
Fair enough.
Judging by all of their posts in their official forum thread they don't give the impression that they are up to anything sus. I'm experiencing relatively low earnings with them at the moment but this is probably just a short term fluctuation. I'll mine with them for another 24 hours before I start looking elsewhere.
Off topic I know, but has anyone found a decent grandcoin mining pool? One that they have used and know to be fair?