Well, wish I could say I felt the same way! I'll report on the installation with my (older) SkyWatcher 10" Dob, this may be useful to others with the same scope. This is somewhat preliminary information because it has been miserably cloudy here in New Hampshire for a couple weeks, and I've only been able to use the setup once.
The SkyWatcher uses an inexpensive single-speed Crayford focuser, looks just like the cheapest Orion, likely made by Synta. A collar screws onto the internally-threaded downtube. The scope is supplied with 1.25" and 2" eyepiece holders that fit the collar. The collar adds 1/2" to the drawtube, the eyepiece holders add another 1 3/8".
The GSO CC, with 3/4" extension tube, initially could not be fully inserted into the 2" eyepiece holder. It was blocked by the collar ID, which in these older scopes had an internal diameter of 1 15/16". Apparently the new SkyWatchers don't have this problem (no response from SkyWatcher Canada as to how resolve this issue on older scopes like mine). I followed Don's advice to open up the collar ID as needed. I used a Dremel with sanding drums for the bulk removal and finished with 220, 440 and 1200 grit emery paper. The CC now goes in all the way, but it is a tight fit to the inside of the drawtube, and scrapes slightly on insertion.
The CC's eyepiece holder is now fitted with a standard 2" to 1.25" adapter to hold the eyepieces. The adapter has a compression ring but isn't a Glatter Parallelizer or other fancy centering adapter. With the CC in place, using a collimation cap, the collimation appears to still be good, with the spot dead center in the mirror's centering ring.
However, the CC just barely has enough in-focus with this arrangement. Using my 20 and 25mm eyepieces, focus is achieved only with the focuser bottomed out. No focus margin at all. My 12.5mm illuminated crosshair eyepiece, which needs lots of in-focus, can't achieve focus at all through the CC. My 15mm eyepiece is in the correct focus range. An additional complication is that the weight of the CC, adapters, and eyepiece is too much for the focuser. When bottomed, the focus knobs won't move the drawtube. You have to help it along by pulling up on the CC. I can likely adjust the focuser to resolve this, but haven't looked into how to do that yet. Once the drawtube is up a bit, the focuser works again.
Don pointed out that ScopeStuff sells a screw on 2" eyepiece holder for this focuser ($39), which replaces the collar. That may be a better solution when using the CC exclusively. It would provide more in-focus than the above arrangement, which would be useful. However, it might have too much in-focus when not using the CC, and switching between the two setups would be awkward, especially at 15 or 20 deg. F. Those threads are pretty fine.
So, how is the viewing? Well, not so good, but that may well be a collimation issue, or due to my inexpensive eyepieces. Stars that are dead center have some distortion or astigmatism with the CC, but are pinpoint without. Stars in the periphery are indeed sharper with the CC, but still not pinpoint, and still seem to show either coma or astigmatism. But - I'm not blaming the CC, since many users report excellent results with it. As Don pointed out, I really should use some better collimation tools, and I have not checked to ensure that the collimation donut on the mirror is precisely centered. That said, using the collimation cap and looking through the CC, collimation still looks perfect.
I haven't decided what to do next. A new focuser would help, tools would help, and a really good eyepiece would provide a sanity check. I'm thinking about it and hoping for clear skies.