Polaris, I actually hadn't heard about it until you mentioned it. I already have a Rock Crusher, so I doubt I would go the attenuator/load box route again.
I read the press release, and it was about getting lower stage volume. In my own experience with a power attenuator, the speaker has a minimum volume level, below which it loses transient response. So it is a balancing act to set up the speaker volume so that it is enough, without overwhelming the stage volume. To me that is the real trick.
Once you find that level, THEN the amp becomes the next thing to address. If you MUST use that 100W monster, then you will need to use an attenuator to allow it to cook the output stage. With a 25W amp, I haven't had the need. The output stage is in pretty good shape at the volume I need. Were I using my Electradyne, even in 45W mode, I would use the Rock Crusher for sure. That amp really depends on pushing the output stage much more than the Rectifier does.
I do really like the JDX. I have used both it and my Rock Crusher for recording and the JDX gave me much better results.