Now this is not from personal experience, I have never shot a static limb curve, but this is what I have read and it makes sense to me. The static limb, does not unfold, maintains a larger string angle; therefore the draw is smoother and produces less "finger pinch." Also, I assume they would be quieter because string slap is reduced if not eliminated because the limbs do not unfold. However, this is speculation, most of the extra energy provided by a recurve compared to a long bow I would assume comes from the working limb concept. The unfolding during the draw to be flexed back during the shot provides energy, and if well designed more speed.
But when people discuss their fondness for about RER arroyos and Kwyk Styk's they almost always mention the fast speed. So what do I know.