Isolation usually helps tube amps. I have my BAT VK75se on Symposium rollerblocks and fat padz. Helps a ton. I'd be hesitant on $700 each for something like this...but I have to say the isolation helps as much as a $1000 power cord...
You can always go to Bed-Bath & beyond, pick up a heavy and thick maple cutting board (like 3 inches or so), put some brass cones underneath to pierce the carpet (if on) and BDR cones in between the amp and maple board. Maybe $100 each to try out...
You can always go to Bed-Bath & beyond, pick up a heavy and thick maple cutting board (like 3 inches or so), put some brass cones underneath to pierce the carpet (if on) and BDR cones in between the amp and maple board. Maybe $100 each to try out...