I bought some on sale a couple of months ago. I don't have enough experience with it yet to say nay or yea. You dilute it so the bottle should go a long way. I don't use my washer much so I don't have a lot of experience.
That said, so far all is positive: I noticed that it sort of foams up when sprayed on the window. It did clean the window but I can't say it was any better that the bottle stuff I had in before. I didn't see any streaks or spotting from it which is why I wanted to try it. So far it is good.