I have owned my Turbo Vado 3.0 for a little over 2 years now. As I ride more and get in better physical shape, I want to go on longer rides. Last fall I signed up for a 30 mile ride with my local bike shop. It was a great experience, and I did most of the ride on ECO, but there were a couple significant hills that I had to use TURBO to get up. At the end of the ride I was down to just one bar on my 460wh battery. I want to do more longer rides so I knew I had to get another battery. I got this 604wh battery a couple of months ago and I love it. I still only ride on ECO unless I am crossing a highway or climbing a steep hill, but the bigger battery means I can go on longer rides without worrying about running out of battery. If you are constantly riding in TURBO or want to go on long rides you really need this battery!