James-v, I bought a used 2003 the Sun EZ Sport AX and I love it. I put about 350 miles a week and to my surprise no back pain. I really enjoy these long bike rides on bike trails. My biggest challenge is the takeoff which is very common in city travel. For this I kept my Electra Townie 7d. I hope you enjoy your bike as much as I do. Happy Trails, Beni