Sadly, it's true, earlier model have had design faults. Hyo is improving, but what was done then have been done, nothing can be said to make it go away. As for the earlier batch with the faults, in other parts of the world, I don't know, here where I lived, most owners repaired it themselves. For those who knows and are informed, they changed to the updated heads, for those who dont, they would change the valves which will fail again. Hyo don't communicate well with their customer.
The post 07 Hyo, carburetted, are great bikes, minor issues, nothing more than what you'd expect of a jap bike, and i've seen em running strong past 50 K without major problems. The post 07 also have better rec. which lasted over 30K, the 04-05 tends to fail at around 20K.
What can be said about hyo now, in 2011, mechanical failures are no more since the 07 model, electrical gremlins are there, but most have it fixed DIY. You can make a Hyo lasts, heck you can make any bike lasts, as long as u know what you're doing, you'd be ok. Most of the issues before was due to lack of support from hyo and from the dealers. When the blown head issues surfaces, most dealers don't even wanna know why it happened. It could've been a simple fix, which Hyo ignored.
However, for the money, Hyo is a well designed bike, engine wise, it is improving, and for now, i can say it is mechanically reliable as long as it's not the 04-05 model.
if you do have the 04-05, please cross check your vin, and please change ur heads or change to single piece stronger valves.
Honda made the same mistake before, but for hyo to repeat Honda's mistake, that is well, ignorant of them. Anyhow, dont be let down by this, the 2010-2011 line up looks strong, and performed great and reliable as well. It's looking good