I like this and the designer comments help me see where you're coming from on the abilities, which helps me understand them better. But does a free product really need to be watermarked?

Yeah, insect pact warlocks. It might sound like a kinda weird idea, but it works surprisingly well and, due to being basically just a new set of powers that any Warlock can take, is eminently usable by players.

At $2, this is probably one of the best low-price PDFs available for 4e.