I also owned a Mak180 "Planet killer" for many years. Never had to collimate it either, always seemed spot on with a star test. It had a fair amount of mirror slop, which was little annoying. That said it gave me some fantastic views of Mars back then, just looked it was already 6 years ago 2014 😲
I sold it and bought a C9.25, which i thought might be a bit more of an all rounder, which it probably is. I would not mind betting though the Mak180 would have had the edge on the C9.25 when came to imaging the planets though. I just couldn't resist the extra aperture.
Here is the beauty "defrosting " after a particularly cold winter morning session. I have certainly learnt a lot since those days, a heated dew shield essential for this weather, look at that poor corrector plate!