Tuono is the same bike .. same engine/running gear and backend.. only difference is the plastics removed and straight bars and nose fairing .
If its 2005 it will be the old shape. Not to much difference but the newer shape is a little quicker/lighter and and looks abit more modern .
Issues are few .. they tend to be pretty reliable . Issues are starter sprag clutch / one of the main loom connectors getting dirty and shorting . They do have a few weird issues but dont really cause any issues as such . Clutch fluid weeps past the slave and makes the fluid go black (does not affect how it works) and rear brake usually does not work (master cylinder is mounted under the engine )
There thirsty if ridden how intended .. i rarley see more than 80-90 to a tank . Comon upgrades are aftermarket clutch slaves and lower gearing and noisy pipe/pipes .
I have had my 06 now for 5 years and still love it.