I pretty much trust everybody's opinion on this thread and I pretty much have to concur. I have feeling though that the rm20 in 240 volt is a step up. I have come to the conclusion 240 volt is the only way to go for power conditioners.
Power conditioners are pretty easy to test. The only thing you need to do is to fatigue them and see what happens. My rm 20 balanced took a dam good beating and I still was not able to fatigue it. The best way to monitor a power conditioner is to apply 300 watt halogen lamp. Turn it on and try to get it to dim.
I had a 1500 watt hair dryer, vacuum, all my gear, tv and I still good not get that light to dim. My monster 2000 dimmed way before that and it's rated the same into 120 volt. My old monster avs2000 was nothing to sneeze at either at 3000 watts.
I use my 14b into the wall since i can't tell the difference dynamically but it sounds like I get less noise due to the isolation away from my front end.