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I had long been considering purchasing a narrowband filter for my OSC and ultimately decided that if I was going to go down that path it would either be the Triad (3 or 4 pass band) or the Optolong L Enhance; I'd personally go for the latter myself.
It largely depends on what it is that you're wanting to achieve. If you want to help bring out the nebulosity then either the Triad or Optolong is going to be your best bet. If you only want to cut down on light pollution (shooting galaxies/star clusters) then I don't think it's worth it as you spend more time trying to get back to a decent colour balance.
My personal thought of using the Optolong would have been to use it to capture the Ha/Hb/OIII nebulosity and then go unfiltered to capture the pure RGB. Going unfiltered captures all of the light pollution but also keeps the proper star colours, the narrowband data would then be used to bring out the nebulosity further.
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