I've never used the glass cleaner or sealant until today (got them both in my mystery box among a bunch of other things). Like the OP, I always pushed up purchasing these items because I had leftovers of generic store bought cleaners/window treatment. After using them today, I'm totally a believer!
I've always loved and found a crucial part of my glass cleaning regemin was using adams glass microfibers (with the other products), and I was happy enough I didnt feel the need to try the adams versions... Not any more, impressed all the way around