Not sure if this has been discussed elsewhere, couldn't find a thread that answered this specific question. If there is, please point me in the right direction

Trying to figure out if Visa Signature is the "next" level past Platinum, or is it just with a little bit more service like the concierge. Speaking of which, has anyone really used that service. I've never really paid attention to the Signature benefits and do alot of bookings and reservations myself.

Any experiences?