I've had the M-Sport (perf) knob since shortly after I got my car (almost a year now), and it's a vast improvement over the stock knob. It's a little heavier, a little shorter, and a
lot less wiggly-feeling, if that makes any sense
With the M-Sport I think the transmission feels "normal", where before it felt cartoonishly long and shaky. I might consider a proper SSK to reduce shift throws some more but the new knob by itself is definitely money well spent.