Best:
Vortex (replaced some accessories I broke on my own, at no cost, replaced a whole scope when I wasnt happy with it and had doubts about it working correctly). CS has photographed their own gear before to help answer questions about mounts, cantilevers, etc.
@MDT_OFFICIAL : sent me updated parts for free for a chassis because I got older stock from a distributor that did not include the newer design.
SOLGW: replaced a BCG no questions asked because it didnt gauge right on multiple rifles.
@Precision Underground : Answered a ton of questions I had about shooting bags to help me choose one, and offered to exchange it if I didnt like it after.
Mark 7 reloading: they upgraded a model in house for me that I wanted, that was a combination of their original design, and the upgrades on their new design, before shipping to me, and continue to provide free on demand support by phone whenever necessary.
Worst:
Beretta customer support, kept a rifle for something like 9 months then never even as much as emailed me when they destroyed it.
AMG Labs (the shot timer guy)...sent an email about not answering emails and back-ordered items...in the email asked customers to reach out about upgrading to a more expensive model that was in stock...never responded to that email either..
Midway USA: changed descriptions on a firearm because the model # was incorrect, after ordering, tried to force me to keep the wrong model product (not what I ordered in the first place) because they 'already shipped it'.
Post office: I believe that USPS hates gun owners. If I could consistently find one company that is responsible for so much missing shit..and time lost, it would be them above all others.