Have you tried asking this question at the fjrforum?
OK, seriously. I have a 2006 model, have put about 15K miles on it thus far. Overall it is a great bike. For commuting, touring, and sport-touring it does everything well. It is comfortable for eating miles, it is fun to fling through twisty roads, it will carry a passenger passably well, hard bags and (optional) trunk provide lots 'o storage.
What I like:
- Strong and flexible real world engine power - good grunt down low, good pull up high.
- Good handling, reasonable brakes, reasonable suspension pieces.
- Good comfort - I'm a lanky 6' tall, and it fits like a standard UJM. Smaller folks have some reach to the bars and usually install risers. Stock saddle is decent, all things considered.
- Good compromise between weather protection and airflow - Less protection than, for example, a BMW RT - but it's more comfortable in warm weather as a result.
- Good heat management for a 1.3 liter bike.
- Easy and inexpensive maintenance. Zero disassembly required to change the oil, filter, and final drive. Valves are done at 26K mile intervals.
- Good solid design - There's no one thing that consistently breaks on these bikes.
- Lots of aftermarket support. I have a Givi v46 trunk - there are probably a half dozen mounting options - Zumo, heated grips, two windshields, etc.
What I would change:
- Too many problems. The bike has had two service campaigns (instrument cluster and fuel computer) and one recall (ignition switch) since new. Briefly stranded me on the road once, but managed to limp it home (and promptly schedule ignition switch recall work!)
- Engine is extremely smooth up to ~75MPH, but then picks up some buzz.
- Fueling isn't up to par for the class. Other bikes have smoother throttle pickup and don't surge as much. Newer model years seem to be better in this regard.
- Less weight would be better. Hasn't caused me any difficulties, but some folks complain.
Compared to the Councours (I haven't ridden a Concours, these are anecdotal based on talking to folks, sitting on the bike, etc.)
- Concours doesn't manage heat as well.
- Concours has smoother engine, more top end punch but less low-mid power.
- Concours appears to be higher specification, e.g. engine has VVT, fancy rear suspension, etc. but doesn't ride any better on the road for it.
- Ergonomics on the Concours are just a bit more aggressive.
- Routine maintenance tasks much more difficult/expensive on the Concours.
- Both bikes will eat tires. They are heavy and powerful, but run on sportbike sized rubber. Expect 4K-10K miles per tire set, depending on what you buy and how you ride.
I bought the FJR because the Concours didn't really exist at the time. It was present at the moto shows, but you couldn't sit on it, couldn't ride it, and didn't know the price or on-sale date. I discounted the Honda ST because it's more a mini-goldwing than a sport-tourer. The BMW GT appealed to me, but I didn't feel offered extra value to a low mileage rider like me for the extra cost.
You can't go wrong with either the FJR or Concours - they are far more alike than different. Buy whichever appeals to you. Kaw seems to have made some nice updates to the '10 Concours, the FJR hasn't changed (again).