I broke one of the TRP SL Ti brakes on my Propel SL & so the obvious choice was to replace the lot with the Fouriers. (My wife thinks I broke it on purpose!) I had read that the Fouriers were only a noticible upgrade from the pre-2015 TRP equivalent & not the later TRP SL Ti versions............I beg to differ! The Fouriers are superb by comparison! Ease of set up, stronger tension springs, better modulation & much more powerful braking! I should have broken my TRP ones sooner!