Feels great!
My biggest worry was hanging out in the wind since every bike I've owned since my very first bike (1983 Yamaha Vision... yeah, I know) has been faired, or at least partially faired like my Katana 1100's. Truth is, it's not a bad thing. I always found my neck muscles straining on the Busa since my body would be happy in the still air behind the fairings while my helmet was hanging out in the blast coming off the top of the windscreen. The first thing I noticed was a lot less wind noise inside my helmet and no sore neck after riding. The wind helps hold you up while moving too. The biggest complaint I have is that my hands got cold, but that's only because I had heated grips on the Busa but none (yet!) on the King.
The upright riding position encourages sight-seeing and visibility of surrounding traffic/etc is much better when you're not crouched down over the low bars. Also, without the fairings blocking the wind, I'm riding at a more legal-esque pace. I always found the Busa hit a sweet spot at 130kph in 6th gear which can be risky when most speed limits are 80kph on my favourite roads. I'm finding 85-95kph comfy on the King in 6th with the engine loafing along... engine is barely off idle which is good since the B-King has only a 16.5L tank compared to 21L on the Bus.
More impressions as the miles pile on.
