Bought these about 10 months ago as I was training to run a 10km part of the marathon (generally a weight lifter), I have had several cheap headsets before this and even purchased a set of skull candy smoking buds, but they just dont cut it for running and kept falling out. Sennheiser headphones get the thumbs up and a cheesy grin from me, I listen to alot of trance with heavy bass, and these are perfect as they allow you to feel the bass yet allow a small amount of background noise so you do not fell a car bonnet as well. They are light and do not cause irritation when on. I use these in the gym now as well, and do not budge when deadlifting, that is the ultimite test, however they are not great for behind the head exercises. These were bought for big bass cardio and perform that task excellently, so well worth the price tag.