This is the second pair that I have owned. The first pair died after about 10 years of hard service, so no complaints considering the price.
Personally I find the large ear pads that enclose the ear to be very comfortable, even for extended periods, though as with most headphones ears can start feeling a bit sweaty after a while. The headband is also well padded.
Consider that these are an enclosed design, sound isolation from sounds coming from outside is not huge, but in some situations that can be a benefit.
On the important question of sound quality they are very impressive (again taking into consideration the price point). They cannot be expected to be as accurate as studio headphones that cost 10x the price, but they are considerably better than many headphones at 2x to 3x the price. Bass, mid, treble, all present in good proportion. Not boomy and bass goes pretty low. Not a totally "flat" response, but detailed and not fatiguing. In the studio I use these mostly for listening to specific details and prefer to use studio monitor speakers for balancing the Eq and the overall mix. I also find them a pleasure to use when just listening to music when its not appropriate to crank up the speakers.
The headphone cord is not detachable or replaceable, so some care should be taken to not wind the lead tightly around the phones when storing. Particular care should be taken to not over stress the grommet where the cord enters the (left) earpiece, Having said that, the cord on my previous pair survived 10 years of heavy use, so this is no more than being sensible.
The construction is mostly plastic, but is reasonably sturdy and quite light. There is plenty of adjustment for different head sizes. The stereo jack plug is a combination mini-jack with screw on 1/4" adaptor. (the screw fitting is a nice bonus compared to the usual budget "push on" adaptors).
I have probably rated "quality" higher than they deserve in absolute terms. They are certainly not on par with top quality headphones, but at less than £20 GBP they deserve 10 / 5 stars overall. If I had £200+ to spend then I'd buy better headphones, but in this price range they are hard to beat.
Would I buy these again? I just have :)