I have owner and loved three SR500s over the years.

Great town bike.
They really shine with decent exhaust, bigger carby and one
tooth taller engine sprocket.
Mine had a copy of a Ducati Conti muffler and a 36mm Delorto
carby.
Really makes a big difference.
Also do the oil re-route to the head and they are very reliable.
The new ones are only 400 so they can sell them in Japan.
Some thing to do with the cost of rego for bikes over 400 in the
land of the rising sun.
You could probably find a bigbore kit to take them to 500.
Had to give it away, could not find a way to transport
the Obsession on a bike.