I can achieve the same results by making adjustments in my IE security settings and it doesn't cost me a dime. The only problem is that it removes some functionality from certain websites (javascript). My guess is that all those pop-up stoppers do is alter your security settings.
That said, I think the only people running pop-up adds anymore are Orbitz, NetFlix, online Casinos, and porn. It appears as though they are in good company. It is not just the fact that I get them, it is the fact that they are sending them that also pisses me off. It is the same mentality that assumes that by interrupting my dinner they can some how endear me into making a purchase from them.