I have an ACC carpet and i like it. I hear ACC is of good quality.Like most other things, you do get what you pay for.I also believe the ACC has the heavy 36oz jute padding and is 80/20% rayon and nylon, made top factory specs.Other things to consider are the heel pad and grommet areas, i'm sure durabilty there can be a factor to consider as well.
Consider home carpet for example.You can buy new carpet cheap or expensive.There is a difference.

David