I looked through one on several occasions. Very nice with pinpoint stars. Only thing I did not like is sloppy focuser with plenty of image shift. Great value at under $1500. Toc, it would be comparable to the C8 - maybe better contrast.
CO is about 30% (25% mirror + 5% from internal baffle iirc). Compared NGC 253 (silver coin) in the 180mm mak and 8" f/4 Newt - not much between these two.