But Sneak Attack can be tossed into a full attack, hitting multiple times a round, and isn't subject to SR.

Yeah, I was thinking the Fey SR progression was a little wonky. I was aiming for you to have fairly low SR typically around 5...which would mean that 5 + class level is much cleaner. Then would it be better to improve SR at 16th level to 10+ or 15+? I'm thinking 10, since I don't want it terribly overpowered.

And yeah, I know the Warlock will be a core class in 4th. Though it will, as of my current understanding, still be strictly descendant from fiendish origins. At least according to Races and Classes it will be.

And there isn't supposed to be a reason to take the official warlock class over this! It's a replacement!