yeh the vt s1's had a heap of trouble when new, but now they are what 10 odd years old so id say they have been rectified by now.
but brakes come to mind killer shudder and bad standard disk replacements, areas prone to rust, windscreen edges, inside of doors, and the door check straps. and the fan a/c switches are usually fault, there also heavy and slow haha, have u thought about looking at vs's as you will get one in a heap better condition for the same money than a vt..