As an experiment of one, I would conclude that yes, the altitude tent system helped.
I arrived on July 4th and spent the night in Durango, altitude 6500 feet. I made sure I started drinking water right away. I did have two beers that night, but nothing more. (Note: avoiding alcohol is a good thing to help with AMS.)
I drove to Silverton on Sunday and kept with the hydrating. I believe I drank one beer on Sunday. We walked around Silverton but did nothing streneous. I did not sleep well on Sunday night, got up twice to pee (versus the 6 times or so when I arrived in 2014.)
Monday I went hiking and climbed the first climb on the Hardrock course. The elevation is 9400 feet in Silverton, and I topped out about 12700 or so according to my altimeter.
It was a slow climb up. I was a bit out of breath, but as it was my first day at altitude, I didn’t let that freak me out. When I got to about 12,000 feet, still going uphill, it was take fifty steps, stop for a ten count, then continue upwards. I don’t think that had anything to do with acclimatization, it’s just there is less oxygen at 12000 feet than sea level.
I felt a little dizzy at the top, but that was all.
Monday night I also did not sleep well, but other than that, no altitude problems. I have continued to drink water and not push myself too hard physically. Tuesday night I slept well, actually slept all the way through the night with no bathroom breaks.
I think using the Mountain Altitude Generator was beneficial to my training for acclimatizing for Hardrock 2015. I have had less symptoms than I did in 2014 arriving just a few days before the race. There are many cons to using an altitude system-lifestyle interruption, cost, change in training, sleep issues, so carefully evaluate for your own use.