@jasperc I'm a bit late in replying to your question - sorry - but yes, I have the X100T set to BWR most of the time although I think the filter effect is fairly subtle. I must find time, sooner rather than later, to set up a test subject with a range of tones and then go through the whole gamut of exposure options to get a better feel for the effects of each setting. Have you done this with your X100S?
@vignouse thanks. No I haven't done this yet but it's a very good idea. Like you I'm gravitating towards the red filter most of the time for that little bit of extra contrast and interest in skies.