I bought a used EOTech 517 off of an OSA member back in the summer. I have really only used it in low light up to this point, but recently got to use it on a bright/sunnt day and found out that the reticle was very hard to see (just would not get bright enough). Went to the EOTech website and followed their troubleshooting steps, but that did not help. I contacted EOTech and explained the issue. They told me to send it back for repair. I did that about two weeks ago and got it back last night. Reticle is now nice and bright and the repair cost me nothing even though the sight was out of warranty (sight was made in 2009 and warranty is two years). Can't say enough about a company that takes care of you like that on a used item that was way outside of the warranty period.