When I was a kid, 35 years ago, it was also a derogatory  term in the
US.  I looked it up in the Urban Dictionary, and there wasn't a single
definition that could have been interpreted positively by people with
disabilities.  

 http://www.urbandictionary.com/define.php?term=spazz&defid=26494#26494
<http://www.urbandictionary.com/define.php?term=spazz&defid=26494#26494>


The chair doesn't look significantly different than several models
produced by Quickie, so if you don't want to be insulted by the company
you buy a chair from, look at those. 

Or are the people at Colours trying to "take back" the term?  If so, I
think that it would have been necessary for the term to have had
positive (or at least neutral)connotations at some point in it's
history.

Kendall 

 

An unreasonable man (but my wife says that's redundant!)

 

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all
progress depends on the unreasonable man.

 

-George Bernard Shaw 1856-1950