Well I have had an Intes MK-67 6” Maksutov for about 5 months.
After having over 15 telescopes this one is one of the best. Its cool down time has never been an issue with me. But I set it up outside and leave it for about half hour then observe. I just love this little scope. If it’s as good or not as good as others I don’t care. The images in this scope are superb. In my Pentax’s super sharp.
In any of my eyepieces it’s sharp.
Now my friend’s 5” Apo beats it in contrast, but not by a long way.
The Mak is super portable and rides atop my eq5 very nicely.
In all I cannot rate this scope high enough.