I bought used low mileage motorcycle in good condition, I replaces the oil and performed all necessary adjustments and checks, it had no issues for first 5000 miles, then the issues started to come. I believe replacing battery each year, replacing starter, replacing clutch components, replacing engine gaskets, replacing two engine front isolators first 15000 miles, fixing rubbed electrical wires and throttle cables because of poor cable management, replacing leaking breather hoses etc are not the parts of standard maintenance for first 10000-15000 miles, but it happened. Standard maintenance each 5000 miles is not a big deal if you have all necessary tools for this, but the motorcycle needs much more.
So I do not recommend to buy Buell XB except you are ready to spend money and time to fix it. Owning a bunch of special tools and equipment is a must if you are going to own a Buell. And not all the issues with the Buell are easy to fix.
Also I do not recommend to take Buell for long trip, it just can die in the middle of the road because of hundred reasons. Buell XB has definitely a bunch of things need to be improved and I believe EBR is more reliable motorcycle because of all this previous experience, I hope.