The ATS acoustic panels have been excellent! We have 2 medium sized control rooms used for sound design and ATS was able to treat both rooms for a fraction of the cost of the other acoustic treatment manufacturers.
The panels we are using include: 8 2x4x2, 9 2x4x4, and 12 2x2x2 per room. Using 2 2x4x4 panels stacked in each corner tightened up the low end dramatically. The 2x4x2 and 2x2x2 panels were staggered on the walls to eliminate standing waves.
The construction of the panels was solid and they look great as well. I highly recommend these guys for both home and studio....you wont find a better value.
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www.gearboxsoftware.com.