I've been running these amps since they came out and SQ is not the T3-1000's strong suit.
The T3-500's aren't the power houses the 1000's are but sound much better in my opinion.
I've owned three 1000's and 2 500's. I also have two 500's on the way from our buddy smartass.
I like them and would recommend them to those who intend to run them 2ohm.

What everyone seems to be missing is the T3-4075 which is by far the jewel in Ultimates crown.