I have an 08 R3T, I bought it new and have had zero problems with it, Unfortunately I have never worn out a set of tires so I cant speak for the Mileage, I have had a total of 5 flat tires since I've owned it, + there was a tire recall a few months after I bought it. I currently have about 3000 miles on the Metzlers I'm running now.
The Gas gauge did take a little getting used to, Not long after filling it up It'll show 1/2 a tank which was a bit disconcerting at first. But the "miles left on a tank" display seems accurate.
All things considered it is by far the best bike I've ever owned and would not hesitate to recommend it to someone looking to purchase one.