I've never pulled an orifice tube from an AC system. I was expecting more chunks or complete blockage. I'm not a fan of any all-in-one refrigerant, but if a car's next stop is a junkyard then I'm fine with it.
I admit to using AC Pro in a friend's truck - reading the MSDS reveals that it uses methylene chloride along with a unlisted ingredient as the "system safe" sealer. Probably a seal swell agent. There's much, much, much worse on the market as far as stop leak goes.