There's absolutely no information in this video about the 5 in 1 blade. This video is simply an ad promoting two of your clipper models. It doesn't even do that very well, either. HOW DOES ONE USE THE 5 IN 1 BLADE? IN WHICH INCIDENT WOULD I SET IT TO THE FIRST POSITION? THE FIFTH POSITION? WHEN USING THIS BLADE, WHICH POSITION IS USED WITH THE COMBS???
We have both the Andis Excel and the Wahl 5 in 1. They are both very good but the Wahl is our favorite. It is lighter, much quieter, blades do not heat up and it's easier to clean. Plus it can be used corded or with the battery. I agree that the blades do not seem to last as long on the Wahl but we have never bought the premium blades so I expect that they will.
Biggest blade size on a 5 in 1 is a 9. So to get the same as a 7 or 7f you would need to use a 1/8 attachment. I would use the second to smallest blade selection which is a 30. I’ve never used a 40 but as the blade doesn’t touch the skin when you have attachment comb on maybe it doesn’t matter if you use the 40 setting.