If you're looking for a Tag I would specifically only buy a rep... simply put the finish-work and such just isn't there on the movements, they're plain, and the watch dial and case details are simple enough that a decent rep is going to be pretty much 1:1.
There's just nothing in them or on them worth their retail asking price. That statement excludes a couple of the newer pretty models with the updated fancier chronograph movements. They've been unimpressive for years, so if you're looking for a great daily beater, pick up a rep Tag.