When I decided to buy the world's fastest production bike in its first year, I knew that there would inevitably be glitches. I just hoped that they would not be major. So far, at least for me, that has been the case.
I think some people may have bought the wrong bike. The last thing in the world I would do with the Hayabusa is destroy its relatively light weight, good balance and aerodynamics by bolting a set of hard bags onto an aluminum subframe and making a pack animal out of a race horse.
There is a reason that the Hayabusa is 175lb. lighter than a Honda ST1100, and that reason is primarily that it was designed more as a sport bike than as a tourer. If you need more carrying capacity than soft luggage gives you, maybe the ST1100 is a better choice.
For those of you who mentioned the Blackbird, if that bike works for you, then get one. They are durable, reasonably fast, and might hold up better to hard bags. Probably a better sport tourer, but not even close as a sport bike. Not to mention the extremely limited ground clearance and the linked brakes which are an abomination in any conditions other than straight up and down on a dry road.
The only case I've seen documented on sub frames breaking involved a dealer welding a crack, then the frame breaking at the weld. I saw the pics on that one.
I pop my rear seat or hump off before every ride and take a quick look at the sub frame welds. If a crack ever starts to develop, I'll spot it easily, but I doubt that I'll have a problem.
One guy posting on here claimed to have had 3 drive chain failures in 1600 miles. My chain has 18000 very fast miles on it and is like new. I use a lot of full power, but with smooth inputs. Some guys use a Busa for nothing more than non-stop wheelies, stoppies and general thrashing. I don't really care, but there is a price to be paid in maintenance and breakage, and I don't want to hear their sniveling.
My problems so far have involved getting rid of the most miserable clutch I've ever experienced on a bike by installing the Brock mod; cleaning the fuel filters once and using Redline injector cleaner for the last 10000 miles, and installing a manual camchain tensioner yesterday as a preventive measure.
I don't consider those things to be important enough to dampen my enthusiasm for the best bike I've ever owned.(I've owned over 50 bikes )