It looks really cool on the bow, but yes you do lose speed and cast because it adds physical weight to limb. It depends on what you are looking to accomplish. Are you looking for a really cool looking bow, or are you concerned with a loss of arrow speed?
Another thing to consider, this happend to me, if you already have arrows tuned for the bow, after you put the skins on the limbs, those arrows will shoot stiff because you are slowing down your bow.
Good luck.