Weak. I suppose I should have known from the price that these would be pretty lame, but they are far more flimsy than, for example, a pair of Sonys of equivalent value. The sound quality is poor, particularly in the lower frequency response and, perhaps even more annoyingly, they leak sound really badly. Someone sitting next to you on the bus could hear your music pretty much as well as you can. Also - and I accept that this is my fault for not checking the included accessories info properly, they don't come with either a carrying case or 1/4 inch jack adaptor. I'd avoid these.