I have been using DMT stones for over ten years now and have not had any problems with them. They will hold up very well as long as light pressure is used, so that the diamond particles don't get ripped out.
I did pick up an Eze-Lap model M round hone a few years ago because of how they were promoted by various Tactical Knives magazine editors. I never had any luck with it at all.
I have stayed away from the Japanese waterstones because of the way they dish out — it just doesn't make much sense to me to use them because of the modern particle-process steels.
I get great results with my DMT hones, the Spyderco Double Stuff stone and stropping.
My favorite Spyderco knives include: Caly 3.5, Chaparral, Delica 4 FFG, Stretch, Para-Military 2, Endura 4 FFG, Manix 2 & Manix 2 XL!