I've used swifts for close to 13years. I've used them on everything from 22-250 up to 7mm Stw. Buds of mine and my dad have them on 243, 270, 30-30, 30-06, 7mm mag, 7mm Stw, 300 win mag And 45-70 with no problems. A few of the early ones I had some issues with the adjustments. They would hold a zero fine, but the initial sight in was a problem. It appears that they corrected that problem around 10 years ago because everyone I've used since then has been good to go. You click it up 2inches it moves two inches, click it down and you're back in the first hole.
The optics are very clear and bright with no distortion, and they hold a zero as well as any of my leupolds. For the money I don't think you can beat them.
My favorite model for hunting is their 4-12 x40
Just my opinion, but I'd rate them well over more expensive nikon's and a little lower than vxIII leupolds.
Just my .02
Hellfire, Doom, Watch the hatred spin
Beyond the speed of sound---
Fire it up, Let the engines roll
It's time to burn it down