I did a couple of comparisons when I got my narrower filters here:
http://www.iceinspace.com.au/forum/s...d.php?t=125922
And here:
http://www.iceinspace.com.au/forum/s...d.php?t=126305
Makes a huge difference from my
extremely light polluted skies in urban Sydney. Balance wise I went with 5nm Ha and 3nm SII and OIII which definitely made it easier to balance the magenta stars from the SII channel.