If you're considering GB based on buzz and without much/any game play, I'd skip it for now and get MET. MET is proven to you and will no longer be available new soon. GB will be for sale for a couple of years or more, so it gives you plenty of time to play it and decide at a later time.
Ever consider TWD? Both Borg Lyman combo pins on a modified fan design. It is the successor to the MET in both design and game-play philosophy. For many, it comes down to theme preference.