I have several of the Omega's and do like them. I like the older Omega's better than the Inline XR model. The XR's have a greenish hue when viewed at certain angles, I think it's a different lenses coating than what you find on the older Omega. The Omega BDC 250 horizontal part of the crosshair remains fine further from the center point than what you find on the 300 BDC crosshair, I prefer the 300 BDC. I've never had trouble in low light, all mine seem to be bright and clear.
I use Nikon's Spot-On app, it works well. I print out the drop charts and carry them with me, I can also use the app on my iphone in the field.
250 BDC
300 BDC
I did send in an Omega to Nikon for replacement/repair a couple of months ago. I have not received anything back yet, everything is on hold because of the virus. It was the oldest Omega I had, it didn't want to hold elevation anymore. I'm guessing that I won't receive the old scope back but will get a new P3 scope.