I spoke to Paul directly. Apparently they don't roll off the high end like most wireless systems, which makes for great tone but way more noise level.
I run the bass boost and treble boost on my Mesa D800+. The Treble boost does cause more noise but I want that clarity on my tone. The Shure unit I tried did not have any noise but the tone wasnt quite as good. I also do have the gain on my amp higher than normal. But I should still not be getting that noise level.
The noise level on the ELF version was unusable. PRA said they have tweaked the Standard version and it works for bass just fine, and should have a low noise floor. I'll be trying out the Standard version this week.
I saw a video on YouTube of a guitar player and you could hear a lot of white noise coming through his amp as well.
So far the customer service from PRA has been great, and they are working with me to find a solution to the noise issue.