IMO, SRF is a no brainer. One bleed with SRF will be about $150 + labor but you'll save $$$ on the labor over the long run. In my experience, SRF recovers a lot better and you don't get that mushy pedal after a weekend at the track.
I had 4 hard track days on SRF, one of which I ran my pads down to less than 1/8". My front calipers turned brown and the brakes at all four corners were smoking. SRF was still good. I had shipped my car from Korea to Dallas and it was 9 months old so I just bled in Motul. The pedal was still good.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red