The enclosure that this kit came with is also much more compact than the OWC kit although bot kits do not secure down the connecting USB chip very well to the enclosure.

I'll keep my old 256G SSD in the (good quality) external enclosure as a backup boot for a few more

The enclosure for the SSD is solid and very Apple'esque and the included sleeve for the drive is a good quality

This thing is fast and the enclosure is perfect.

Also included is as USB 3 (2 compatible) enclosure for the new SSD (clone old SSD to new) and to put your old SSD in when you're done

Comes with the special tools to open a MacBook Air and replace the SSD as well as an enclosure for the removed unit to use it as external storage

The enclosure that this kit came with is also much more compact than the OWC kit although bot kits do not secure down the connecting USB chip very well to the enclosure.

The external enclosure is very attractive as well.

Bonus, the external enclosure enables me to reuse the original SSD