The first thing you notice is they look very similar to the Goldring NS1000s. I do remember reading somewhere that Blackbox and Goldring headphones are built the same in the same factories, its just the audio technology that differs. This is clear from the very similar designs. As it was the extended headband snapping that lead me to getting these M16s its a bit of a worry to hear they have similar if not exactly the same build quality, but to be honest I have a large head and dreadlocks so I apply a bit more strain to the thin strips of metal and rubber than most would.
I have to wear the M16s fully extended and even then I would prefer just a little bit more extension, but its not enough to take away from the listening experience and is still very comfortable. More, but a lower quality of, padding than the NS's. The switch requires far less accuracy to find but requires a touch more force that I would like. They protrude from your head whilst wearing them a touch more than the NS's and are clearly larger (as pointed out by several people on my first outing with them!), but overheads have never been the smallest types of headphones. Overall they are probably not as comfortable as the NS's but only due to the slightly shorter extension, but they look good and feel quality.
Apart from the basics (freq response and noise reduction) I'm not too sure what the specs for headphones actually mean, I prefer to go on the actual sounds! The NS's cover more frequencies according to the official specs but in my opinion it doesn't matter as the sound quality is greater in the M16's all round, if only by a touch, and the extra range of the GR's isn't really that much of a bonus as the M16's cover 20 to 20k, the average a human can pick up, and the range most music producers tend to work within. All sounds are richer and fuller with the M16s and good job too as all other aspects of the headphones don't warrant the higher price tag. The sound quality increase is not as big as it was when I went from the Sony MDR NC7's to the Goldring NS1000's, but still a clear and confident increase. Each sound is clearer more pronounced and tones come through with more definition. The most important thing for me is always how well phones deal with bass, and these do not disappoint, probably the best headphones in terms of bass I've owned. Its not overwhelming but clearly dominant when it needs to be.
The BlackBox M16s probably are not the best in terms of value at the RRP of £165.00, but considering I picked mine up for under £80 at play.com these headphones are epic!
