Black Widow says the carbon limb longbows are 3-5' a second faster. I got around 8' with my informal (no hooter shooter) testing. Was also using heavier 62" bows to compare.
The mass weight is quite a bit less which may account for the increased limb speed.
I always thought PLs had little hand shock and vibration, but the carbon seems even less in my experience.
Some folks might not like the look as much as the wood and exotic veneers though. Much to Toby's chagrin, I have rattle canned an exotic PLX a time or two. 😀