Just received my set 1/8/2020.
I read another review from a customer claiming one bit was missing in their set. I too thought I had one missing; the 1 mm bit. I discovered the bit had fallen out of it's location and was lodged under the cross-brace inside of the metal box. So, if you order a set and one seems to be missing check inside the box it may be under the brace as mine was.
As for the drill bits? I'm sure they will be very usable. With my assortment now (Alpha numerical, decimal, letter and now metric); I can size holes for threading closer than the normal 70% standard engagement for threads if need be.
As more items become metric this is a good addition to my shop.