I’ve had 3 Fastfires.
The first one wouldn’t hold zero. Returned it.
Second one- the third season I had it, me and a buddy came up on a pair of Osceolas 17 hours from home and my site had quit working. Somehow, I still managed the gobbler without a working site. But barely.
Third one- when you turned the site on there was a central red dot in the middle of sight with a red streak from top to bottom. That was it for me.

I’m on the third season with a venom. I’m not saying that it is a better sight than a fast fire but I’ll never go back to Burris sights.