Yes, so it's been 4 weeks now! I feel wonderful! I skipped over my chronic fatigue good day (40% of my old self's energy), skipped over my energy level before CF, and now feel better than my adult life! It feels like I'm 24, and just started a hike in the mountains. The first 1/2 hour of the hike, you are hit with an oxygen buzz! I feel like that ALL the time.