I had the AO black diamond in 6-24. The optics were quite nice with a very very slight 'Euro' yellow tint - made viewing mirage amazingly good. Target image was crisp despite seeing the mirage. Really weird and you need to see it to understand. Would make a great target optics.
The reticle was a bit heavy but mildots can seem that way. target turrents worked well.
Can't remember why I sent it back to Burris but it needed repairs. There is no Canada repair location for any Burris products - Colorado only.
What I hated about this scope was the turrent markings were 7 1/2 mins per revolution. Went from 0 to 7.5, then 4 clicks (1/8min clicks) back to 0 which now represents 8.
So each revolution, the markings have a different value! Not sure which rocket scientist thought this up but renders the turrents useless for in the field elevation changes.
I have not seen the newer side focus so can't say if saddled with the same silliness.
Overall, the optics were not bad at all and the scope did hold and track well (although you didn't always know where you were). Big and heavy but did have quite a bit of elevation in a 30mm tube.
I would never get another if they kept that stupid markings system but it is more scope for the money then many Leupolds.
Jerry