I would buy a Tasco before I bought a Vortex. Or a Burris, or a Simmons.
Summer before my sheep hunt, I took every 60mm and 80mm spotting scope they had at Sportsman's Warehouse out on the sidewalk and looked at the rocks on the NE corner of Cheyenne mountain. Good thunderstorm brewing, so light was marginal; good simulation of early or late day glassing. The Vortex got kicked 1st. Compared to any of the others, they failed miserably in light transmission and edge clarity. The Vortex scopes I've looked at suffer the same issue.
Ended up with a Nikon 80mm. Just couldn't bring myself to spend twice the money on the Swaro 60mm. Comparable light, edge clarity, weight. Almost bought the Swaro 80mm. It was visibly better in all regards, but (always a but), it cost a little over twice as much (on sale) and weighed another 18oz more. Weight becomes more noticeable at 13000'+, lol.