The Skywatcher OIII filter gives a wider bandpass than the very narrow Baader OIII, so the view is not so dark, and yet it still provides incredible contrast on the right targets, such as the Veil Nebula in Cygnus. I've seen that with an 80mm scope and this filter. Stars stay as distinct points, so it seems to have a good accurate surface.
I would recommend this filter very highly as it does the job as well as any, and at a very affordable price.
