Right there...Speed. Before I pouched my Back the UW was unbelievably long. Having to curtail my rotation I've lost a lot of distance, even so, it's still forgiving... and thank God for the shorter Shaft.
I know the 23 is only in Japan but I wonder what That little Beast would be like? 190-200 with 110 peak height? That would be fun to see on a calm day.
It's tough deciding when $$$$ is considered. Even when fitted sometimes it just won't work on Course. I was never fitted until I purchased my ZX5s always being able to modify my Swing to make a Club work. Never had extra Clubs laying around. Nothing worse than failed Dreams of "The Perfect Club". 😀