I have one (ATD) and from the little I've used it, it has functioned without problem and it shot where I pointed it. I think I paid $99 for it new years ago when they came out. IT IS NOT IN THE SAME BALLPARK AS THE BROWNING IN QUALITY. I've read from other owners about problems with looseness in the bbl assembly. I have not had that problem, mine is (still) tight.
Since you mention the 10/22, I will say of the 2, I would take the 10/22 hands down. I don't generally care for Ruger products, but in my opinion the 10/22 is the best semi auto rimfire rifle ever produced. There are literally tons of after market products out there for this rifle. None that I'm aware of for the ATD. I'm lucky enough to own a legal, NFA registered Norrell full auto 10/22 which I've put probably 50k+ rounds through without a hint of wear or breakage of any kind. Shoots @ 1000rpm, and stitches up a target like a singer sewing machine while never jamming. Can't think of any other rimfire which would stand up to those operating parameters.
Its hard to argue with a gun that fits and feels better (especially to a woman) but I do think the 10/22 would be the superior choice.
Jon