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Well, I saw you ordered one of those big 36mm ones. I got mine from amateurgeologist. Belomo variety. After doing research on the net, they came highly recommended. And I must say, they are very...

Heres what I am talking about:

10x
20x

Oh yeah, I used the camera zoom, so the actual magnification is a little less than depicted.
You can see the line left over after the magic marker test....

I agree, I can't see a 30x loupe enabling us to tell an exceptional edge from an adequate one. Hence, I only use it to test the bevel.

I use a 20x by BelOmo, from amateur geologist. I love it so much I bought a 10x. The 20x is a quadruplet loupe, IIRC. The picture is very clear, I highly recommend it if your looking for a loupe....

Honestly, I'm incredibly impressed that you can even use the 30x.

I use the black marker test and the loupe to make sure the edge is being honed.