Understood. I just do the vinegar because it's so much cheaper (about $3 a gallon) and it works really well. I've been doing it for about a decade now. Yeah, I do have to flush out the coffee maker (mine is a brand called iCoffee) to get the vinegar odor out but since we have a well, water only costs as much as the electricity used to pump it.
Vinegar is also a better substitute than Windex for cleaning mirrors, windows, etc. I also use it to shine my stove, dishwasher, and microwave. It's antimicrobial and non-toxic, too, as opposed to ammonia-based cleaners.
Yeah, I've heard of vinegar being used to clean windows. We used to do it as kids growing up.