I had a couple given to me at the SHOT show some years back and I ran one on my 835 and gave the other away. Both of them ran fine for several seasons, held zero, no fogging or condensation issues. I switched to Benellis and the Burris 2 and 3 fast fires as the whole rig is just so much more compact.
At the price point they sell them for - saw what looked like the same sight for 50 bucks at Cabelas recently, I'd just replace it. They aren't going to be as tight as better optics of that style but the price is hard to beat.
As an aside, I did really like the red and green color option and the ring around the dot. Wished the Burris had that - the ring that is and now Holosun does with their 507c so I'm switching from Burris FF3 to see how that works. Very compact and small, RMR footprint.
Maybe call truglow. You never know what they might do.