I don't buy many American products because whenever I've tried in the past, the quality, and customer service has been shoddy. Americans can't assemble things correctly, ship wrong or obviously defective products, fail to fill in customs forms properly, and then expect me to just shrug my shoulders and accept all that rather than acknowledging issues and trying to fix them.
I realise that my experience is limited to the handful of times I've tried to buy stuff from the US. Perhaps I've just been very unlucky, but frankly, the odds are against it.