It's relative. Coming from an FZ1, I imagine the FJR pillion is a veritable Bike-O-Lounger. Coming from a 'Wing or LT, not. My wife and I moved to the FJR from a CBR XX; she thinks she's gone to heaven. The Feej handles the needs of the two of us well. If we're out more than a week, we just take a week's worth of clothes and stop along the way and run a load of laundry. We've outfit it with a soft, expandable tail pack and tank bag and we have all we need (she even packs the hair dryer and curling iron). We routinely run 300-450 mile days (many others do much longer) and are fairly comfortable, though do take frequent breaks. I've done a 540. I've mounted D&D risers and a Corbin (I would do a different seat in retrospect) and it is pretty good. The bike is basically bullet-proof: mine has 48,000 and no problems to speak of. Gobs of power, handles pretty well in the twisties (for a large, 650 lb/ bike) and is easy on the eyes. It has comfort, convenience and a fun factor up there in the 9s. Best SPORT/touring bike I've ever owned.
Good luck.