i love my dropzone, but its got some thin little teflon tubes in the innards that wear out and get gunked up. the manufacturer advises replacing them yearly. i was leaving for a week in Ga of hunting and put on a standard tt micro because i knew there wasn't anything in the world that could go wrong with it. it didn't even cross my mind while i was down there once. so for the sake of piece of mind i have to say the tt.