Unlike the previous revision of the case, this one is good for the OP-1 Field too: the instrument fits inside snugly, while the power button doesn't accidentally get prodded and turned on. You can also fit the instrument inside with a Decksaver on, giving additional protection - although in that case you can't really fit anything much in the small mesh bag compartment inside the case.
Build quality of the case isn't anything to write home about. It's a garden variety EVA case with a cheap zipper. No problems so far, though so giving it a thumbs up.