I have a lesser Beyerdynamic headphone, and I love it, and I also bought the HD600s on sale for about the same price, and I also love them. The Beyerdynamics I have are bright, and some people don't care for that, but the Sennheisers have a sound signature that I don't think anyone would find offensive, so I think your safer bet is to buy the HD600s on sale rather than the 1990s at full price. They have a return policy if you don't like them, and if you do like them and decide to keep them, you got a great deal on them.