What are the best Room Accustic Treaments members have found?

Books, shelves, art & carpets.

But then, I spent a few decades in sound studios, so I'm probably odd man out here.

Synergistic Research HFT may transform your room, but they probably don't do much to improve the acoustics.

Just as some cables are gross tone controls, so are SR products effects!

you'll need some skills and patience.

+1
A few decades of experience helps as well... and not backing down to the 

If I were designing a recording studio, obviously a whole different approach is required. However, the last thing I want in my media room is recording studio acoustics.