Used Meguiars D120 for the past 12 years and just recently started using G6 last couple months or so. Really a good cleaner for glass and doesn't smear or streak. Also use to wipe over headlights, taillights and aluminum and chrome. Now buy in 5L jugs.
Pros: works extremely well
Cons: nothing yet

One of the best glass cleaners I've used! Love the streak free finish it leaves! Will definitely buy more!

My favorite glass cleaner by far - and I've tried a ton! So easy to get clean and streak-free glass with this stuff, combined with 2 quality no-nap glass towels. Evaporates quickly, not watery, and leaves nothing behind! Will be buying the 5L.

This stuff is fantastic! I can never seem to get a streak free dirt free windshield - this stuff did the job its almost like seeing without glass everything is crystal clear - its well worth the price! All pros and no cons!

Love the streak free, fragrance free formula. I used it on my personal vehicle to see if it lived up to the claims and it did! Definitely will buy it again.

This is a superior glass cleaner to most out there, expensive, but works really well. Cleaning power is on par with Stoner Invisible Glass, but in a non-aerosol form. I really like this product.