I love my granite worktops, would not have anything else. Yes, they are unforgiving if a cup falls out of a cupboard, but nothings stains, they are fantastic for pastry as cool all the time. Wiping down and streaks/polishing depends upon where you live; if like me you have hard water and a limescale issue, then if you wipe with a damp cloth you will get streaks. the absolute best cleaner is Method ( black bottle) that you can get in Sainsburys, spray, buff with a glass cloth or microfibre and it is fine and shiny. If you dont have any Method, then a squirt of shower cleaner will do the trick, I think it is something to do with the silicone in it. Shop around for your granite, big difference in prices, and to be honest, the overlays dont sound very cheap for what is a compromise, but that is just my opinion!