You mean the extended warranties? No experience with those, math doesn't work out. The best part about HFT is they're so cheap if something dies a little young you can replace it and it'll still cost less than a major brand.

I did recently have an issue with something that sat in a box for over the default 90 days before I ran into it (which turned out to be the operator that was the issue). I couldn't return it or get a full refund after the 90, but they gave me a gift card since support couldn't get it resolved and the hassle, which worked out to about ~25% of the product retail... The next day however a product engineer from corp reached out via email trying to figure out how the tool could have failed abruptly, found the issue was me not them. Exceptional UX.