In fact, I have used a dedicated snow tire, and I think the T/A is a step below a snow on a snow packed roadway. I was able to travel at 50 mph comfortably, and change lanes without losing any traction. That is adquate for my purposes.
I'll have to take your word for it about the WRs, at $139/ea (in my area) they better be damn good in the snow. For me, WRs or a set of snows (and rims) was not worth the expense for a car with 140k on it. Luckily, the T/As are a great compromise.
Obviously, for driving through deep snow (like to a trailhead, for example), I'd love to have a set of dedicated snows. But for your typical sunny Colorado winter, where roads are rarely snowpacked for a more than a few days, I think the T/As are a great choice.