My W802a has this option and it's pretty cool. Supposedly it uses no interpolation and you can definitely tell motion is definitely a lot clearer than without it. Makes 60fps games even more amazing.
The picture gets really dim though. I don't even think it's bright enough for me to use in a dark room. Also noticed a little flicker every now and then, but it gets rid of 3/4 of motion blur, so I think it's a small flaw.
Should only add less than 1 frame of lag, so maybe around 20-25ish ms on my w802a with game mode.
Yeah seeing it action really was a revelation, especially since I had been away from my set at home for months and had been gaming on a cheap 42" Sharp 1080p set (60hz). That set was a blurry mess compared to my Bravia at home.
I finally understood what all the fuss was with backlight strobing. Once it clicked with me it's very, very hard to give up. Backlight Strobing + local dimming on my set produced some very sharp visuals.
I'm getting older now so don't really play competitively all that much anymore, so I can live with a decent input lag with good/great image quality on a TV set.
My HX950 is pretty dim as well, but I usually run backlight min or 1-3 anyway. Currently with Motionflow Impulse on I run at a Backlight 7 which is about what it looked like on min.
Only issue I have with the HX950 is it can't do motionflow with game mode on (unless a newer firmware added that feature to this particular set), so I've been gaming on general with most interpolation settings/image enhancements off.
That Samsung JS9000 in this thread has been gathering quite a lot of accolades from everyone who owns the thing, as opposed to a lot of complaints about backlight bleeding on certain model 2015 Sony sets. But from what I understand, it's all or nothing in game mode on that particular set. Backlight Strobing is disabled in game mode, but local dimming can still be selected on the Samsung.
Also input lag outside of game mode is downright scary, so it would be an all or nothing situation where I'd give up strobing backlight for an overall better set.
tl;dr backlight strobing works with little to no interpolation on Sony sets in game mode, even in 2015 models (though the setting is renamed for 2015).
I'm just trying to find a way to not give up backlight strobing while gaming on my next set.