The headphones are good for the price. Better than most headphones you can buy for a high price at a retail store.
Sound quality is worse than E8/E9, but for the price it's hard to find a better one.
If you want the best sound quality, then go with E9, if you want a good compromise, go with E11.
ANC is also not as good as E9, but the sound isolation from just wearing them is quite good.