I can't resist adding two companies to the list of those with outstanding customer service:

Wiley-X sunglasses(which are also balistic/shooting glasses) - For some reason I manege to break even the most rugged sunglasses made, and I've received at least 2 brand new pairs of sunglasses from them, completely free, when the originals broke(mainly my fault). I've also received replacement parts such as arms, and they even sent me an extra set of arms when I asked them to, again completely free. Most of the time the products had been purchased years earlier and were probably beyond the warranty period.

Streamlight flashlights - A while back I was using their penlights a lot, and for some reason had a number of issues with them(I forget the specifics), but they repaired or replaced my items multiple times. Other than that one product I haven't managed to break any of their other products, despite heavy use and abuse.