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FWIW, after decades of owning newts my first refractor is a 15cm f/8 Celestron branded Synta. I think I was lucky and got a pretty good lens (I've heard their QA isn't perfect). Initially the CA was objectionable so I got a Baader FringeKiller and placed it on the front of the diagonal so it's always in use. That reduced CA noticeably but introduced a yellow cast. Over time both the CA and yellow cast have 'disappeared' ie. I no longer notice them. Everyone seems to agree it gives quite nice views.
The thing I found more annoying is the shaking when attempting to focus. It's on a GC5 which handles the weight easily but with the focusser a good 50cm from the dec axis you have a lot of leverage when you touch the tube. Initially I upgraded to an add-on motorfocus but eventually the mechanism in the focusser developed so much sideways play that i upgraded to a Moonlite motorfocusser. It's wonderful and makes the scope so so much better to use. Being able to get the focus spot on possibly gains me half a magnitude in limiting mag. That of course translates to better lunar and planetary views as well. Because you don't have to fight the focusser it also keeps you calm and that provides a better viewing experience.
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