I was happy at the amount of nebulosity that the filter picked up. It's a pity that this cheap filter is not also available for 1.25" and 2" eyepieces as I'm sure they would sell like hotcakes!
Nice image ... I'm amazed to hear this filter described as "H alpha", it's a broadband short-wavelength blocking filter not at all dissimilar to the Wratten 29 - which certainly is available in eyepiece fittings (I have one in 1.25", I use it as a moon filter because it preserves night vision.) I would have thought a "H alpha filter" should be a narrow band-pass filter.
The W29/B+W 091 has a bandpass which starts about 10nm shorter thus has a little more transmission in the visual range - which is probably useful as it is quite dense. It still blocks almost all the light pollution, even full moonlight when used photographically.
Baader do a fairly reasonaly priced 7nm bandpass filter in eyepiece fittings, two versions centred on Ha and OIII.
