The sound insulation on these headphones is way better than I expected. Obviously there is still sound from my drums leaking into the headphones, but it is very low.
They are incredibly tight, to the point where after some time they become uncomfortable and start hurting my ears, but the tightness is necessary for the insulation they provide. They are also a little shallow, which contributes to the discomfort after a couple hours of playing. You might need to take breaks, so your ears can chill a bit.
The sound is good, they are not studio-grade headphones, but for monitoring and even casual listening to music, they do an amazing job.
Overall I am very satisfied with this product. I do believe, though, that if the cushions were a little deeper, it would have made this product 100% better in terms of comfort.