I use targetfirst as my default for adsense and it works really well. Dont think this is any different.
I just went to check out Targetfirst. EVERY SINGLE LINK I click on (except login), I get a POPUP - "You have chosen to open timetrack.aspx" - NO, I have not. or, "You have chosen to open conversion.aspx" - NO, I have not. EVERY DAMNED LINK - POPUP. EVERY TIME I use my back button - POPUP. I click cancel, and they download it anyway. There it is, sitting on my desktop. Are these people nuts? They bashed me senseless with popups, until I left, cursing. I don't care now if they are giving away gold. There are some things you simply don't do. Either they have a big technical problem, or they are just plain crazy. Time to cross this one off the list. My list, anyway.