There is no longer a heat problem.
Never has been a "problem". Many complaints, but not problems. And not according to some posting here with '06 heat complaints. Certainly not as complained about as earlier models, but many of us think the problem with earlier models is overstated. Here in Central Florida, it's 90+ degrees damn near 11 out of 12 months and I've never experienced the "roasting chestnuts" complained of by some.
Valve ticking seems to have been solved.
WAY too early to tell. You're probably right, and hedged your bet using "seems". Let's hope so.
New venting eliminates buffeting and negative pressure,
New venting has nothing to do with buffeting and negative pressure. Strictly a windshield issue. Which many are STILL unhappy with. Search for "'06 windshield replacement" related threads.
adjustable handlebars and seat height help alleviate most fitment problems,
Strictly a subjective statement. What works for a 5'2" pilot ain't gonna work for a 6'7" rider, considering the tiny range of adjustment provided in the seat and bars
Described as "useless" because of its location
inside the fairing compartment
passenger pegs lowered, moved forward and outward,
FINALLY, a quantative observation. And patently unimportant for anyone but the occasional passenger.
seat is more comfortable,
Again, strictly subjective
adjustable headlight aiming knobs are now provided,
Funny...my '04 has adjustable headlight aiming knobs, just not accessible while driving. So what? You should not be adjusting your headlights while driving. You can do that on an '04/'05 before driving. Minor convenience feature.
three washers in front fork help eliminate stiction problems,
Been reading posts here for the year + this forum has been in existence. Don't recall a single stiction-related post in that time. Yamaha apparently fixed a problem I don't have with my '04.
elongated rear swingarm and slightly stiffer spring provide smoother and more planted feeling,
Swingarm extended 1.3 inches, yet the wheelbase remains the same...how'd they do that? Sounds like a compromise would have to be made in either rake and trail on the front end, or swingarm pivot to steering head distance...1.3 inches SHORTER to compensate for the addition "out back".
If the rake and trail were "tightened up" to accomodate the lost 1.3 inches from swingarm pivot-to-front axle distance, then the steering has been compromised compared to the oft-praised stability of 03-05 FJRs.
If the rake and trail hasn't been tweaked, then the 1.3 inches gained in the back half of the bike will have to come out of the pivot-to-steering head distance, meaning a 1.3 inch loss in the seat to bar relationship. No wonder Yamaha put adjustable bars on it.
On top of everything, while the swingarm has been lengthend 1.3 inches, the rear wheel travel hasn't increased at all. That makes no sense. It tells me that the shock isn't being worked as hard as on earlier models, which tells me a cheaper shock will suffice. And if a cheaper shock CAN be used, then it WILL be used. No manufacturer doesn't cut corners when they can.
And the slight change in the final drive ration is an almost meaningless amount of "slight". What is it? 50-60 rpm?
I can't imagine you're gonna get ANY "I hate my '06 -- wish I had my '0X back" replies. No one wants to admit to making a $13,000 mistake and buyer's remorse is hard for folks to verbalize and admit to.
Probably the biggest reason to trade is the "gottahaves". Gotta have a new one.
Speaking only for myself, except for the YCCS, nothing about the '06 is evolutionary, or revolutionary, enough to make me consider trading. Except for the "newness", I see it strictly as a lateral move.