I've had my T5XI 3-15 for about 2 years now (with updated turrets), It's been through a tracking test and ran several matches on two different rifles with different calibers and performed flawlessly out to 1400 yards. I am quite confident in it's tracking.
I really like how the turrets are setup, you cant ever get lost in them, and like how the windage turret limits you to only making a half rotation in either direction.
I've seen people complain about the eye relief, which I think is actually quite good. I don't think the clarity is the greatest in it's price point however, but it's certainly more than acceptable. The fit and feel is on par with more expensive scopes. Overall I think the scope is a tremendous value especially considering it's USA made. Also the included lens caps are excellent and stay snapped on the scopes very well, I wish more brands would include a proper set of fitted scope caps.
I think these are one of the most overlooked scopes on the market these days, whose sales haven't yet recovered from tracking issues that they had in the beginning. I say buy now while the deals are still available.