lario's are great little bikes , absolutely recommended .
the valve issue's are well documented,
if you expect to run it 20.000 miles a year, get something else.
if you want a great summer toy go for it.
handling with the right tires is amazing.
personally i have been running one as daily transport for a decade, also using it quite hard .
( two up holidays , or spending up to 700 miles/day virtually flat out)
i've seen quite a few dropped valves, usually i managed 45.000 miles on a motor.
I should probably start rebuilding them after 40.000 as a precaution, valves are a lot cheaper that rebuilds.