I toss my hat in the ring every now and then when this comes up, but anyone in the market for one of the plethora of LOW offerings in the sub 2k.price point would be doing themselves a big favor by looking at the XTR3. Head to head with any scope in its price point, its very tough to beat.
To the OP, There's no question that the glass in the ATACR is better. Is it worth double the price, some would say yes, some would say no. You're the only one who can answer that question for you.