here's my take as I've used Testors Metalizer, Alclad, and Talon.
Testor: As you said, its very delicate, but great look. Buffs up to a nice shine, but don't even try to mask it with tape, it will lift.
Alclad: Great stuff. Been using it for a couple of years, you definitely need to have a very nicely finished surface. All imperfections will show through. The only big con for me has to be the smell, its Lacquer based, so its strong stuff and you need to clean your Airbrush with lacquer thinner. You do need to primer your model for best results. Great range of colors.
Talon: Just got it and had some experience with it. The main reason for trying this out is that is Acrylic based and very little odor. Your airbrush can be cleaned with whatever you use to clean water/alcohol based Acrylic paint. Still need to prime, but on small surfaces that will not need masking, have had no problems with paint lifting so far. You can shine it up more with SNJ powder, but I haven't tried that yet. Not as wide a range as Alclad.