Ah-ha.
This explains a LOT! Thank you very much indeed for the information.
I didn't know about the 2 grades, as I have never come across the CCS 25 - only the 525!
I'm afraid the CCS 25 is out of my league.

I daresay the Custom Shop page was well hidden.

I'll have to keep looking for info on the CCS 525. Few do seem to have experience with it.