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What''s the use of aperature when high power won't work due to temperature equalisation problems, sub standard optics and mis-collimation when ever a passing bat farts?
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Cooling down can be an issue it's true, but large refractors will suffer from the same problem though to a lesser extend. A 150mm refractor is a thick piece of glass. Takes time to cool down.
Easy solution to solve cooling down issues: take the scope out 2 hours or so before observing. Easy.
What's the use of aperture? Greater brightness at a same magnification will help you see tiny details of low contrast. (see the illustrative picture posted previously).
It is however true that instruments require proper collimation. This is also true for refractors although they typically do not require the user to perform collimation. That being said, my Mak does not require collimation either. Holds it extremely well. Regarding optical quality, maks are usually good performers due to the relative ease with which spherical optical surfaces can be produced.
For good optical quality (never tested it myself though), have a look at the orion optics website in the UK where they certify the optics up to lambda/10 for newtons. Some models are relatively affordable.