I have the SBE II and my hunting partner has the Vinci.
Both great guns.
Vinci feels lighter, but is a little bigger and bulkier. Nicer to load than an SBE II. Both kick about the same with big hunting ammo. No magazine extension for the Vinci, but that only matters playing around with clays. You can float a shell in the SBE, but we couldn't get the Vinci to do it. Vinci doesn't cycle upside down but the SBE will not that that matter either. Also, the Vinci is way cheaper than a SBE II.