Well, I think the pros of Yeson are:
microscalpels - no tissue is removed - minimal scarring
permanent threads - keeping the shape of the new commissure during the first 8 weeks of healing - can be fastened tighter than dissolving threads
placement of sutures - deep enough to form a funnel instead of a gate.
glottoplasty, no CTA - CTA removes vocal range
no scar visible
high patient happiness according to his survery
cons are:
4 weeks of voice rest plus 4 weeks of minimal voice use
long recovery time
expensive
long distance
no CTA in addition to glottoplasty - less increase in pitch possible