The sole purpose of this $10 per track service is to add 2dB gain. It doesn't even manage that without messing it up.
Thought that sort of digital audio behaviour died in the 80's..
It's not a constant factor. It only happens on some of the positive peaks. Very strange behaviour.
It does sound as bad as it looks when the clicks occur in music.
Verdict: the free 30 second trial wasn't worth the price.