Michael 2 notice about Chamfer and Fillet:
1. When you type zero it not become zero. No reset.
2. When you select 2 distance and chose distance by mouse, first you select first distacne and it make the second the same. Nothing critical becouse you after that select second. But when you repeat action to set that distances once again it become a bit annoing thus when you change first the seond changing too. It will be good to change only first distance when you set it, and only change second when you set it.

And how measure work when angle is not 90? I measure one distance but chamfer or fillet is less than that distance.