Mechanical vs Electronic E6B:

One day in ground school, I decided to challenge my students to a little E6B faceoff. My whiz wheel vs their electronic ones. We went through some problems in our text book (that I had never seen) and I was faster every time. Also only needed one hand to do work the wheel. Yeah, they were more accurate but a manual was faster and easier to handle in the plane.

The duffel is fine, I would suggest spending $20 or so on a small, padded headset bag. Those have a nasty habit of getting beat up and it happens to be your largest investment.