Speaker wise these are very good as far as computer speakers go
a friend of mine has the older Z-5400 and they sound nice which have been replaced by the link ones
others from Logitech that friends have are Z-2300,and X-540
All listed sound very nice when paired with a quality sound card.http://www.newegg.com/Product/Product.aspx?Item=N82E16836121120
I view Newegg reviews very subjectively Sennheiser's business is headphones and microphones and has been for a very long time.
I've owned a set of hi-fi headphones from Sennheiser and they were very good lasted 20yrs.I now have AKG's but they aren't in the computer product line.