Ok mine arrived (well before I expected) and I have to say I'm very impressed.
This is a solid little unit, and the build quality is really much nicer than I expected.
What I really like though is everything is just straight up dead simple and really easy to use, no digging through menus or any hassle like that you come to expect with speedlights. The screen is super clear and bright (you don't see that in the images).
And the sound beep with remote power control is just solid clear and simple. Inside an Apollo softbox power setting is dead easy.
The unit mounted is not much different to the speedlight/trigger combination in size (just a quick snapshot) -
The battery pack is is much smaller than what I expected from the images, the complete pack is about the weight of a speedlight, but the lithium battery itself weighs very little.
This is not a massively powerful unit, if you're thinking Einstein as a comparison they are not even in the same ball park. Its hard to compared to speedlights as the light is really so much different, but I'm getting around a stop more light than a 580ex etc in general, direct with 28mm refelctor/zoom, bounced, and in an Apollo softbox. Which is pretty much exactly what I was expecting, the even light spread from bare bulb plus a stop of light. The recent Dison Genius or Jinbei units only just match a speedlight in comparison.
Where the CL-180 is actually really coming out ahead is in HSS, 1 to 2.5 stops ahead of the Canon flash. Thats a number of (expensive) HSS enabled speedlights it would take to match this one unit. (We can add the 40D to the list of Cells II HSS compatible cameras).
In general I'm really happy with it so far, I shot lots of test shots in a few hours, many at close to full power, and I never thought once about over heating or changing batteries. Haven't touched a single AA battery or recharger since starting, and I won't even charge the pack tonight.
This thing just keeps trucking on, its not cheap, but compared to a Canon flash for a similar price it offers all the better parts, like remote manual and HSS, no slow down, and no AA's
This is not a monolight replacement, but for many people it going to be a much better alternative to similarly priced a Canon or Nikon Speedlights etc.