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Nice Martin. I like the "excessively smooth background" myself. That is because when I see through my eyes at the world around me I don't see noise everywhere I look. I see a smooth seamless noise free image as I look out the window. Apparently I would conclude that nebulae in far off reaches would appear the same way too. Maybe I am wrong but everywhere I look in the real world I don' see noise. Ergo it must be the same elsewhere!
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I don't totally agree with that Paul, while I agree with you on the fact that we don't see "noise" when looking out of the window at our surroundings our eyes see things very differently to a camera and this perhaps is one of the negatives about the digital era in that we can manipulate data, sometimes in an artisitic way or to over sharpen, over smooth etc. Seeing an image such as this by Martin with the very smooth background is probably not how you would see it it in real life as I feel some of the more intricate detail in the structure of the nebulosity is masked because of it. This can be compared to the digitally enhanced images that you see on the front of glossy fashion magazines of super models with lovely, blemish free, smooth skin. Is this how they would appear if you saw them in person? No they wouldn't. Please note that when I made my comment about the image looking too smooth for my liking I mentioned nothing about noise. This wasn't a criticism it was a personal point of view.
At the end of the day it is like people have said, it is a personal like or dislike about smoothing and sharpening. Personally I don't care much for either as I prefer the results without which is why I have changed my workflow in processing my images
Best wishes
Gordon