Pros: Metal and leather, extra cables, crisp audiophile type sound, above average noise cancelling
Cons: Price-possibly, slightly tight fit, lacks bass for the mass-market crowd, only plays with noise cancelling on
First off- I got these for $130 from Newegg, and for that price they are a bargain. The $400 list price is way too expensive. Th fit and finish are beautiful on these, my only complaint would be the earcup caps are plastic. it comes with a nice case, and 3 different type cables. These are noise cancelling headphones, and the noise cancelling has to be on to produce sound. The noise cancelling is above average in quality, though not quite up to Bose standards.
The sound: Crisp, detailed, great range. These are in the same vein as an AKG K550 or a Pioneer HDJ-2000 in the way they sound. sparkly highs, clear vocals and mids, and nicely textured bass. The bass will seem light to the Beats/mass market crowd. The T350 has a little more bass than the k550 and a little less than the hdj2000, which is plenty for the headfi crowd.
If I had my way, I would remove the active noise cancelling and plastic caps. As it stands, these are a bargain at the current price.