i've had 600's, a 750, 1000's with 170hp and i have to say a ninja 250 is probably my favorite bike i've ever owned... i probably wouldn't want to have it as my only bike today, but along with another bike i'd take another one in a heart beat, and if it was a first bike i'd definetly recommend it... plus there is such a demand for them you can sell them in a heart beat... and yea as far as mileage, unless you buy it, ride it every single day as your sole transportation for 10 years you'll never see the end of its mileage