Hi, I also tried the BFI in past and I had very good results but it was nothing compared to a good use of Ultra Low Motion Blur.
with my AOC AG251FG (240Hz G-Sync monitor) with an hack I read on blurbaster, using the CRU I was able to reach ULMB at very low refresh rates like 60 Hz or 50Hz and even less.
if you use BFI at 120Hz to run 60 Hz game, you know perfectly how good is the like CRT scrolling.
With the ULMB to 60Hz you get the perfect CRT scrolling without the burn in that you see with the BFI. and you know the burn in is also noticeable in-game.
the other advantage to use the ULMB is that it is done hardware by the monitor, no weight on the CPU, just to enable it when necessary
if you are interested, read this:
https://www.blurbusters.com/60hz-ulmb-hack-howto/