Hi Ken,
Yes the S30V will hold the edge longer and if it got really dull you might need the diamond rods the get the edge back. But if you use the Sharpmaker to touch it up frequently it will keep a razor edge a long time.
I used my Mini RSK a lot and at the time I did not have a Sharpmaker; it got a dull edge that was made worse by my inconsistent hand sharpening. I brought it to a local knife shop (BM dealer) and they ground a new edge with a belt; it is now again like new.

Aus 8 is a great inexpensive steel. I will never hesitate buying a knife made of Aus 8 as well as 440C and a few others.

S30V is a great steel but many other common steels used on quality knives are quite acceptable.