I've got Renthalls on my XR650L. They were on the bike when I bought it.
Renthalls are a dime a dozen here but only found on dirt and dual sport bikes.
The really trick bars are Pro Tapers. Big diameter near the steering head and then tapering off to standard size at the ends. This gives you more force or torque on the bars, which helps in tight trails, mud and sand. Because you dont need as much force to turn the bars, at the end of the day you arent as tired as you'd be with standard bars.
Not really worth the money for someone who is just out to have fun. More of an uneeded race item.
Did someone say V-Max?

I had 2 of them..............er....well 1 that I owned twice. 2nd time I bought it, I didnt realize it was my old one until I cleaned it

At least I knew it had been taken care of for most of it's life