These are great but they aren't loud enough. I work in a very loud industrial environment and we are allowed to nap between work sessions. Usually between 10 and 30 minutes. But we can't leave or post. In order to barely hear it I have to put in my headphones and shove my head into the sleeve of my jacket. I have used the 90 minute one every night for over a year now and love it btw.
Well, that's a valid point! I think 99% of people have the luxury of listening in a quiet room and I don't want them to make themselves deaf so I keep the volume at 20%. ;)
Justin Michaels