These guys have ****ty service AND a ****ty product. Just goes to show that being a good salesman is more important than being a good craftsman.
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I'm not aware of any real "salesmanship" by TAG, I think it's just that people get suckered in by their low prices. It's been a few years but I think when I first got my 4th gen T4R (or maybe it was the 3rd gen) I looked them up and a full bumper, custom built, was priced around $550 I think. That's crazy when most other builders START around $700+ and when the really nice ones are in the $2k range. Someone who doesn't do a lot of on-line research might well look at TAG and say "hey, these guys have great looking bumpers and the prices are unbeatable!"
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The thing is, if TAG was selling the same bumper for $300, I think more than a few people would start asking serious questions. But their prices are not so far out of line to make people take a second look, so I'm assuming that's how they stay in business.
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Of course, once they get the money, it's the whole "sunk costs" fallacy: i.e., you've spend your $500+ shipping for the bumper, then when you get delay after delay, you figure "might as well keep pushing on this, after all, they already HAVE my money."