I have them on mine as well. I bought them way back in 2006 for another bike I had at the time. They cost me a $40 for the pair through a local dealer. They aren't that cheap anymore.
They've been on plenty of bikes and finally made their way onto the Superduke two years ago. They look good, offer a decent view and do not disturb the air too much. If you can get them for a decent price, I'd say go for it. Cheaper than many other options out there and work good.