I'm glad that this thread re-surfaced. I missed it the first time around and have actually been thinking about starting basically the same thing for awhile. However, I think that Dave said things much better than I would have, and set a great tone to the rest of the thread as well.
I'm perhaps a bit different than most of the posters here as I started freehand (sandpaper and oil stones as a kid, eventually waterstones 6 or so years ago) but then I also purchased a EP about 3 years ago.
Mikemac made a great post back on page 3 where he touched on a some of the benefits/ reasons behind using both jig and freehand.
Freehand? Jig?
For me the answer is YES!
I've used both methods for probably over 15 years, and they each have a place. I just added the EP, and that has to be one of the most versitile and "bang for the $$" jigs around. I find it very useful for re-setting bevels and angles - correcting mistakes of the past and setting a path for the future. I've also used it side by side with freehand. And I find it really convenient for throwing a great edge on either beaters or daily users when I don't really have the time to concentrate on freehand (which in my house is most of the time) Lately, I've had to tame my OCD for all things sharpening, tame my OCD for knife lust, and instead try to put a meal on the table to enjoy with the wife and kids before one has to go sports practice, another to a friends house and the third wants to sit and watch tv with me.
IMHO, the EP is a great solution for someone new to sharpening, new to J-knives or someone who thinks that steel rod thingy or a chefs choice are sharpening options.
While I truely prefer to freehand, my freehand experience makes me appreciate and do a better job using the EP...and the EP improves and makes me do a better job freehanding.
I like Marko's analogy. When I first started to cook, I followed a recipe for french toast. No I don't. But if I'm cooking something new, say a tagine or Indian, I follow a recipe first.
So I'll 2nd that notion but then add some of my thoughts and experiences too.
One of the biggest misconceptions that I feel people have about the EP is that there is a very short learning curve and very little skill or understanding involved in using it to it's full potential. I feel that there is less of a learning curve / motor skill development required with the EP than freehand and that you can be a "proficient novice" with the EP faster than you can be freehand. However, mastering the EP takes time and the same understanding of the mechanics of sharpening, steel, edge performance, and cutting application.
I had a pretty solid background in freehand sharpening and sharpening theory when I bought my EP so it was more a matter of learning the mechanics of the system than learning how to sharpen. My first day on the EP I put the sharpest, best edge on a knife that I had on any other up to that point in my life. However, almost 3 years later, I feel that I am still improving both my EP and my freehand skills.
For me the EP is BOTH
1) a "quick and easy edge-production system": the one I reach for when I've got a pile of junky, abused friends' knives to sharpen
and
2) a "scientific tool of edge geekdome": the one that I reach for when learning a new steel or knife, diagnosing and repairing a problem, or just really nerding out with thinning behind the edge, compound bevels, or maximum attainable sharpness.
I've also been playing around with some EP tricks. One is creating a changing or "rolling" bevel where the angle is more obtuse near the heel and more acute near the tip for a knife where the tip is used for detail work or vica versa where the belly is used for rocking. It's a bit hard to describe this method without pictures, video, or and understanding of how the EP system works, but to put it simply the edge angle on the EP is dependent both on the height of the pivot point of the moving stone arm as well as the distance of the edge from the table so by either hanging part of the blade off of the support table and / or adjusting the angle of the blade in relation to the arc of the stone arm.
However, once I've figured out the best combination of angles, convexity, and polish, I do most of my edge maintenance freehand with strops, hones, and stones. I recently purchased my first j-nat from Jon at JKI and I couldn't be happier with it. It's fantastic for finishing, smoothing out a compound bevel or quickly touching up an edge that's just past where a hone or strop can bring it back to 100%. Freehand sharpening might still be my favorite, but I also enjoy the EP. I have the "Pro" version which is largely hand built and assembled. There is an amazing about of care, thought and, pride that went into it's design and build. F&F is very precise and it feels like using an old, pre-CNC, machinists' tool.
If I had to make an analogy between EP and freehand I would compare swimming to rowing or running to riding a bike.