The PX 100 are an excellent set of portable headphones that would be ideal to those who travel constantly and require a comfortable set of quality sounding headphones.

We can’t recommend these headphones. The sound quality is below average, they lack bass and they’re uncomfortable. A disappointing effort.

For their price, the CX 300’s offer a more than adequate replacement for your standard iPod headphones in terms of sound quality; and you’ll also be pretty pleased with their bass levels.

A wonderful set of closed headphones. The sound quality, while not quite as good as the PX 100, is quite impressive and the only real issue we had was with comfort.

If you are a fan of earbuds and are on the move a lot, the MX55 might be right up your alley.

As far as earbuds go, the MX90 VC are a great choice, offering impressivesound quality with a stylish and stable design.

The MX70 headphones do not live up to the reputation created by Sennheiser's other earbud products. The clip on design means it is difficult to make the earbuds sit properly and their sound quality leaves quite a bit to be desired.

An excellent choice for those who like the noise reduction feature, but the bulky battery pack is a major disadvantage.

If you're looking for a cheap but effective alternative to your stock MP3 player ear buds, then Sennheiser's MX series offers a lot of good choices. They don't provide the best quality audio around, but they are a noticeable improvement over default iPod ear buds.

A typically high quality product from Sennheiser, the PXC250 headphones offer a good alternative to products from Bose if you're looking for something a little cheaper. The audio quality is impressive although it doesn't quite beat what's produced by some top tier IEM manufacturers.

Offering the best noise cancelling out of any pair of headphones we've heard, Sennheiser's PXC450 offer a great choice for frequent travellers; just make sure you can charge the hefty cost back to your company.

If you're after a high quality pair of noise-cancelling headphones and can do without the TalkThrough feature found on Sennheiser's PXC450, then the cheaper PXC350 are a great alternative.