Glows are certainly not a defect and will not detract from the final image provided the correct techniques are used during capture and processing.
With more expensive models of Hypercam, you can bypass some of these processing steps.
The IMX183 sensor is the most popular deepsky astro camera sensor due to it’s extremely low price and high sensitivity, but there are other more expensive models which have zero glows of any kind (such as the Hypercam 26C or Hypercam 533) and some which have minimal glows such as the Hypercam 269C.
The 294C has starburst in the upper right corner about the same as the 183C.
Astro cameras such as these will outperform any DSLR in sensitivity, and read noise, however, learning the best workflow for that particular sensor is necessary to achieve the results
When it comes to calibration with CMOS cameras in the sub £1000 range, most use Astro Pixel Processor and finish off the image in Pixinsight or Photoshop. Many of the best imagers use all 3 software packages.
You can download Astro Pixel Processor (APP) here for a FREE 30 day trial: Download AP
Starbursts can be detracted from your images using calibration techniques (darks, flats etc) there are multiple examples and workflows on YouTube that you can follow that explain how to remove these.