Recently traded for an Eotech 512 on INGO. When I got it, there was a dead spot in the middle (was clear at any other angle). Was a May 2009 (8 years old) model. Was g2g verified by seller, so we assumed something happened during shipping (established member, no doubts). Eotech took it on and is doing a full rebuild free of charge. With all the bad press that almost put them out of business, they are straight away to provide first class customer service at no cost!! Assuming I get it back well in a couple weeks as they say, A+ to Eotech.