It is good that you question my desire for a coma corrector, after all money doesn't grow on trees. I was inspired to get one by some posts I read over on Cloudy Nights, coma correctors seem popular for visual use below f/5
I use a mix of Explore Scientific 68 and 82 degree eyepieces, plus a Televue 32mm wide field
I observe distorted stars at the edge of my FOV, somewhat like the following image:
This distortion is apparent across all of my eyepiece focal lengths, so I assume it is coma. It is noticeable even in my Tele Vue eyepiece, which I know will be very well corrected.
I believe my collimation is reasonably tight as I use a Farpoint laser collimator and fine-tune with a cheshire. Skies haven't been steady enough recently to do a proper star test, but the centre of my FOV seems pretty crisp.
If I'm wrong please let me know! As I'm writing this I realise that it might be field curvature, need to check that when the skies clear over Sydney.