For home, my first choice is waterstones. They are an elegant solution, producing a fine edge, but at home I have an unlimited supply of water, I can use a large stone on a benchtop, I dont have any time constraints and i have a belt/disk grinder to "dress" the stones when they need it.
I dont know why RM recommends them for field use. They are fragile, they need frequent re-dressing, you need plenty of water, they can be heavy by themselves and are certainly heavy when charged with water, they can take an age to dry - especially in cold conditions and if it freezes when it's wet, it will shatter.
As Adi has mentioned, either the DC3 or DC4 is the perfect field sharpener IMO. The diamond side will hog out metal at an alarming rate (even though it's a fine, 25 micron) so must be used with caution, but useful for repairing damaged or dinked edges and they work well with the (hard to sharpen) fancy alloy stainless steels like S30v as well as plain old carbon. A few careful strokes with the diamond side to bring back a good edge and then polish it in with the fine (and far more gentle) ceramic. For the most part, you can just use the ceramic side, reserving the diamond for more "demanding" sharpening. They wont wear out (OK actually they do wear, just very, very slowly), they maintain thier true flat profile so dont need dressing, they are very tough, they are very light and compact, they wont freeze and you dont need water. Perfect!
I agree you need to know what you're doing with them. You can bugger up an expensive knife pretty quickly with a diamond hone. But if you have a little experience and know when to use what, they are excellent.