If you're considering Sony's MRD-NC200D noise-canceling headphones, the first thing you'd probably ask me is whether they're better than the Boseor Bose models.
The short answer is no. I found the Bose headphones slightly more comfortable to wear, and they effectively block out more noise than the Sony headphones. On top of that, I'm more partial to Bose's sound.
That said, there's a lot to like here. Excellent design, flavorful sound, and the NC200Ds cost $100 less than the Bose QuietComfort 15s. At $200, they're not cheap, but comparatively speaking, they're reasonably priced and worth checking out if you're in the market for a pair of noise-canceling headphones.