After consistently using on the highest intensity for 6 months, I'm pretty disappointed in the Nood device. I have dark brown hair and skin on the lighter side. Despite exfoliating, shaving, and using consistently for months, I've seen only a very minor reduction in hair growth. The armpits seem to have responded the best, but I still have to shave twice a week at least. The tracking app seems like a great idea, but after 4 months of tracking it stopped working, I can't regain my progress so I just gave up on tracking. I'll keep using it until it stops working, but I don't see a reason to buy from this place again.