In viewing, I have noticed a tiny bit of springiness in the scope when pointed lower down near the horizon. This is mentioned as a potential problem in The Dobsonian Telescope book.
It is not much and since the scope has a drive system it doesn't affect viewing, but I notice that Obsession's 22" version adds a length of steel to the tips of each of the foldable side bearings.
http://www.obsessiontelescopes.com/t..._UC/index.html
Might see if I can add this reinforcement to my scope too if it doesn't increase setup time and fits easily.