I reckon these are the competition....
http://www.catseyecollimation.com/cperch1.html
You can have a look at ours on Saturday night.
The basic adjustable chairs are fine if you don't need lots of height (bigger DOBs) or very low to the ground (longer refractors) ... For us the Cats Perch suits both needs very well. They break down pretty well for travel. Be nice if they were lighter, but then nothing much about our total astro setup is very light.