I still remember the first time the shells fell of my eyes concerning Coticules. I had been shaving with straight razors for 8 months or so, using one of Dovo's loom strops with red paste to get a decently shaving edge on my razors. The other side of the loom strop I had pasted with Chromium Oxide, but I couldn't really figure out if I liked it better or even needed it. I owned a Coticule and a BBW, almost right form the start, but I couldn't get them to work. I had been doing pyramids between the Blue (supposedly 4K

) and the Yellow (rumored to be 8K

: ), and got nowhere. On the few occasions I noticed any difference before and after, at times hours, of almost pressure-less strokes (never more than the weight of the razor, I was told

), my razor definitely was duller instead of sharper. I could get a very good "kitchen sharpness" off my Coticule, but nothing more. The pasted strop did the rest.
Eventually, I got help from 2 guys who knew what they were talking about, David Polan and Josh Earl. Both Coticuleers of an early hour. They independently of each other had the same message: "Get your bevel up to speed on another stone, and finish on your Coticule, using only water". They also both recommended the DMT-E (1200 grit) for bevel work. I figured out a honing progression with the DMT, a BBW (light slurry) and a Coticule (water only). The full description of it is collecting dust in the SRP&D wiki.
I also learned to appreciate a CrO stropping after that progression.
Anyway, back to what I remember as my first "real" Coticule edge. There namely is a difference between the smoothing out the maxed out keenness off a DMT, and a pure Coticule edge.
I was sitting at a friend's diner table, during a meeting with a couple of fellow traditional shavers. As usual, we were playing with hones and razors while having a wee chat and a sip of Whisky. There was a glass of water on the table with small pipette in it, to add a drop of water to the Whisky. I had this thought of adding a drop from the pipette every 20 X-strokes. At the end, it came as a surprise that the razor popped a hanging hair. It was a surprise because I knew it was easy to loose the HHT on any razor by a mere bit of honing on a Coticule with slurry. But never before had I been able to revive the HHT by means of just a Coticule.
And then there was the shave with this razor, which was of unknown comfort, both in terms of skin-friendliness and of smooth cutting action during the shave.
I have been chasing to copy these results ever since. It took several attempts to repeat that first, almost serendipitous result. But eventually I became better at it.
We are over three years later now, I don't think anyone is going to need struggling for as long a period of time, as some of us did. There is more information available. The only thing there is no replacement for, is practice. Honing razors is a bit like learning how to ride a bike. It takes regular practice and some perseverance at first, but once learned, it's a skill for life.
Bart.