just my 2 cents...
while most of the feedback you get from the F6B community will be positive I will play the part of devils advocate since I too came from an ST1300.
Considerations
1. Weight - it sounds like the use for your bike is primarily commuting? The F6B is heavier and harder to maneuver (also, longer wheelbase) in tight spaces/parking/traffic etc.
2. Helmet Storage - Can't fit a full face helmet in the saddlebags. My ST could fit my Arai full face with no issues - my F6B cannot.
3. Comfort - no doubt that the F6B has plenty of room and is comfy but I would argue that for us taller riders, I'm 6'2" the STs riding position and adjustable windscreen is more suited for tall riders in stock form.
4. Speaking of windscreen, as you'll probably read that is easily the most complained about part on this bike. I've ridden bikes w/ and w/o full fairings, windscreens, shield, etc. and this bike has a fixed windscreen that in stock form doesn't offer much for wind protection.
All that said, aftermarket parts make some of these pain points fixable but at your expense. I absolutely love my F6B and consider it one of the nicest bikes I've ever ridden. Luckily for you the F6B are not making as big of a splash on the bagger market as Honda would have liked so they can be picked up well below MSRP, so if you do your due diligence you can pick one up at a good price.