I've been shooting several 22RF bolt repeaters with mostly pre-BTR Cronus scopes, and have been very pleased with these scopes. A year or so ago, I put a pre-BTR Cronus on a Bighorn TL2 Dasher, and took it and a custom 7-08 Improved 30* with an Ares ETR down to the 600yd line on my range. It was an unusually dark, overcast day, and my impression was that the ETR was very bit as clear & bright as the Cronus. To be fair to the Cronus, I noticed some water spotting on its objective lens later while cleaning both rifles at home. I'd had it out on a day with some really light drizzle, and hadn't wiped the objective lens clear afterwards. That could very well have been the reason I thought the ETR's glass was at least as good as the Cronus on that dark afternoon. Whatever - the ETR didn't get any darker at 30x than the Cronus did at 29x, so there isn't a tremendous amout of difference on that point. I do believe the Cronus has a little bigger eyebox than the ETR, noticeable when both are set to approx 24x-25x, and more pronounced when you're running them both at max power. Some guys categorize the Cronus' knobs as mushy, but personally, I find it easier to dial one click at a time with them compared to the very sharp/distinct clicks of the ETR. Now that I've run this ETR on a 40XB 22RF repeater, the 7-08 Imp mentioned above, and a M70 in 6x47 Lapua, its elevation turret has smoothed out a bit, or worn-in, and is now easier to get that one click when that's all you're after. Never had a complaint on the click/detent of my Cronus turrets, and I'm running four of them.
I really need to run a tall target & box test with this ETR - have done so with all four of the Cronus scopes on the 22RF repeaters, and having had excellent results with them, it boosted my confidence in their tracking. Have not had any memorable issues with the tracking of this one ETR, but doing the tall target & box test would only increase my confidence in its tracking & repeatability.