The GSO 6" Classical Cassagrain is a bargain for $500. I did have to tweak the collimation once it arrived but since then I have been very happy with the views of the planets, double stars and even some DSO's although I have other scopes for that purpose. Below is my 2nd try at imaging. Basically the scope will put up a better image than I am yet capable of rendering...learning curve. I did own a 6" Mak for a couple of months but I could never get it to acclimate so I sold it and bought the GSO 6" CC and have not had any cool down issues with it.
The 6" CC is definitely a unique instrument and fills a niche in my modest collection with its focal length and design.