I agree with sir crackien.
I owned a 2006 KLX250S which is the dualsport version of this bike. It was a great bike for what it was, but it lacked range (even after I swapped in a larger tank from a KLX300R). It is a bit anemic from the factory, but there are quick a bit of performance mods that can be done for free or cheap. Carb tuning, airbox mods, removing smog equipment, exhaust changes, airfilter changes, etc. Because the engine is based heavily on that of the proven KLX300R, there are tons of aftermarket options available for performance enhancements. For example, there are at least two different big bore kits available to take the displacement up to about 300cc or 331cc.
Any way you cut it, though, it's an around town bike - especially this super motard version. I just don't see where you could take it and legally have fun with it. At least the dual sport version was made to get offroad and knock around. That's where it really excelled. It was an absolute blast in the woods. Light enough to throw around and do just about anything, but plenty of power to boot.
I sold the KLX250S to get a KLR650. I can't say enough good about the KLR. I have never loved a machine as much as I loved that bike. Everyone has there preferences for dualsports in the 650cc range, but I am a definite KLR disciple. It's the go-anywhere, do-anything bike. Actually, it's a lot more versatile, than the Versys.
I sold the KLR to get my Versys. I think I will eventually love the Versys as much, but it truly is apples and oranges. The KLR was good at things that the Versys just won't do at all (offroad) while the Versys is the street machine that the KLR can't even pretend to be. As many have pointed out, unless you are really going to get a chance to do some offroad with the KLR, you really need to be looking more at the Versys. I was fortunate enough to get a decent amount of offroad time, but not enough to justify the compromise in street performance.
I can say with zero hesitation that if I could choose two bikes to own right now today, it would be my Versys and the 2007 KLR (older generation) that I sold. The KLX250 bikes would be awesome to have, but there are just too many bikes out there that do what they do plus bring other options to the table as well.
Obviously all of this is just my opinion, but I've been told that my opinions are better than most people's facts.
Every bike discussed here is a good bike, though, so pick one (or two) of them and have a blast.