Not been RTW but do have a KTM690 and had no problems at all with it so far. Don't think you can beat it regarding fun factor, really strong/quick and handles very well both on tarmac and gravel and can do very technical sections (at least if you're a better dirt rider than me). And much lighter than most options including bikes like DRZ400. Part availability is maybe biggest problem but from what read reliability is really good:
Read somewhere that no one had ever regretted they didn't take a bigger bike for RTW...meaning many people take to big bikes.