I have their other product (BQC35). Try asking them ehich one is better in terms of sound and ANC. The BQC35 is quite good, and i suspect they are one of the same, but in different shell. If Dyplay can confirm those two are the same, or better yet, the Shield is better, then it's worth the price.
Two of the reviews on the BQC35 in AE said that their unit has a slight hiss when music is not playing. My unit is safe and practically silent, but it's a problem to keep in mind if you decided to purchase it (also a mention to @jfvny and @RobinFood )
Some reviewers in youtube said their Mifo o7 clips/distorts when listening on loud volume..does your unit has similar problems?
Also, have you by any chance have tried the Galaxy buds too?
I have listened to the Mifo's at the max volume that I can comfortably handle (approx 75%) and there is no distortion... so all good