First off Mr Hill....WELCOME to the site!
Seat is subjective.
For 500 mile or so days I think the stock seat is fine......many say different but EVERY bike I've ridden some people say the stock seat is adequate and others hate it.
Heat issues were greatly reduced with the Gen II and III.
I've ridden my 2008 in triple digit heat and it's wasn't extreme.
Keep in mind EVERY full fairing bike will give off some heat.
The FJR is a 600 plus pound bike, every 600 plus pound bike feels heavy when you're moving around the garage.
The FJR is the LIGHTEST of all the major sport tourers and it handles very well, better than most for it's size, it IS more compact than the other major sport tourers.
Maint is easier too on the FJR and the valve adjustment intervals ar the longest (26,000 many go longer) than any major sport tourer.
Buy one you won't regret it!