I can confirm that one of the premium pools is a scam, I mined at smc.hash.co for 2.5 hours at 5 m/h, today I have a total of 0.00000000 coins confirmed/unconfirmed there, never got one satoshi of s coin, THAT IS A SCAM POOL!!!!!!!!!!!!!
I've made 150+ coins from there since this morning with 5MH. They're already in my wallet.