Well, I guess I've never really had a problem either way. Just a matter of using the right tool for what you are trying to accomplish, I guess. I sharpen freehand, with a Sharpmaker, guided with an EdgePro, and with a belt. They're all useful in the right place, it's just a matter of deciding what you need edge-wise. The Sharpmaker isn't my first choice, but it's darn good for touch-ups when I don't have the time or ability to go back to a more capable system, say when I'm riding my motorcycle. The Sharpmaker fits easily into the side pocket of my small backpack, where none of my others do.
There's a bit of a touch to getting it working right, though. The blade MUST be profiled beforehand. Don't even *try* to re-profile a blade with it, you'll just get massively frustrated after the first two hours of little to no effect. Even with the diamond rod covers, it's still to fine for profiling. However, if you have a blade that you have profiled before with something else (benchstones, EP, etc) then it does a very fine job of making a fast brush-up while you're on the move. No it won't make as fine of an edge as an EP or a skilled person freehanding on a 30K stone, but it is a great alternative to having to use a blade with a big roll in it because your twenty pounds of good sharpening gear didn't fit in your backpack.