They are good running, and smooth saws (like a 661), but they are heavy for their size. I believe the 460s are (powerhead) 14.75 lbs, and the 576 (autotune version) about 15.25.
Jason, it depends on the situation. If you have to climb over logs and through the brush and "reach" now & then, the weight makes a big difference. If you have heavy equipment setting up the logs for you to buck, I'll take the faster/heavier saw every time.
I don't know what your wrap handle weights, but my info is that a 660 is in the 16 lb range, a 064 in the 15 lb range, and a 460 in the high 14 lb range. Who would not pick an 064 over a 460 that is heavier.
I'm really looking forward to getting my 044/046-D hybrid. The power of a ported 460/576 in a 14 lb powerhead!

Hard to beat!