For home and auto, yes this is a great way to clean windows. I use Zep's simply because I have experience with it, and I only buy one can every two years, it's a small expense but worth it to me.

I had to use Zep's when cleaning aircraft windows since 1) that was what was provided to me, 2) commercial and corporate jet windows have to be perfectly clear during a flight since there's no pulling over to squeegee the cockpit window if the cleaning crew messed up.