Burris service has always been great when I've used it. I bought a couple of used, made in USA Signature 3-10 scopes last year. There were issues with both of them and the reticle drifting when changing magnification. I sent them in, got the notice they were replacing them with Veracity 2-10 but the scopes were on back order. I had already replaced them and was planning on selling the new scopes. I called Burris, spoke to someone about what they actually had in stock and told them the plan. He said no problem, ended up getting a couple of Signature HD 5-25 scopes, and they didn't make me pay the small difference in price.
The ONLY problem I've had with them was Fullfield II and Fullfield E1 scopes and those damn stiff magnification rings. I had a couple E1's that were so stiff in the winter that I'd break polymer mag levers off. They sent them back saying there was no issues, they performed as expected. I used to be a big Burris fan, but I'm drifting away from them, mainly because I don't care for their current reticles. The original ballistic plex is the best version.