I think the difference between the AT version and non AT is greater than that on the website, but websites are often inaccurate.
I plan to run a 576 at GTG, so I can have my own opinion.
I remember I got slammed pretty good for stating that I hefted a 562 and 362 side by side in the store, and they felt the same wt to me. The Husky site (at the time) had under stated the 562 wt, and everyone said I was crazy. Well now some actual wts have come in, and Husky has revised their website, and turns out I wasn't quite so crazy after all. So much of this "feel stuff" is subjective, and what one person likes, another may not.