I currently have Spyderco sharpmaker. It has the medium and fine stones but I am looking at adding the ultra fine stones to my set. I have two questions; 1) is it worth it to get the ultra fine stones? And 2) how do you store all of it if you have the ultra fine stones as well? There is only enough room for two sets of stones. I really do t want to leave a set out in the open. I want something to keep everything together for ease of carrying the system to work or just to keep it all in one nice case.