I see people using a Celestron brand reducer/corrector and other brands reducer/corrector for an 8" SCT (mine is a CPC800). I would use it for moon and planetary imaging primarily though I always look to the future when making a purchase. Maybe it is not needed to image planets & lunar features? If it is or is not, is their an advantage to buying a Celestron brand verses another brand (like Astrotech). The off brand ones are much cheaper and maybe better? Anyone have any experience? I see most people using the Celestron brand.
On a side note are older used ones better than newer ones? My scope has a 2" visual back and is about 4-5 years old.