Benefit of cable lifters on 100 wool carpet.

I second the room treatments. Critical speaker alignment and placment are second after room treatments.

I agree, cable lifters are definitely an 'Emperor's new clothes' item ;--) Except in two instances:
1.) Always use them when you have an electric radiant heating grid under the floor (and it's turned on ;--) and
2.) Sometimes, lifters can make a difference when you have a steel-mesh (or re-bar) reinforced concrete slab-on-grade. This is not a slam-dunk tweak, and depends a lot on the speaker wire and/or the single ended (not balanced) IC's being used. Do a dry run with any nonmetallic blocks (bricks or wood 4x4 pieces or small cardboard boxes.) If you roll 'snake eyes' you don't have anything to return ;--)

My floor is wood so it seems unanimous that the cable lifters will be unnecessary.
As far as room acoustics are concerned, I found them just too difficult to get right. This was one of the reasons that I went to a computer based desktop system with mini-planars, Stylaudio Carat Topaz USB DAC, and Monster Power HTS-3500 power center. I can realign my planars with ease whenever I am in the mood of a change.
Thanks for your responses.