Instruct: Classify an Amazon review as either positive or negative.
Query: Not necessary if you're very careful!

These companies are just trying to make a buck on those who are careless with the screen! I have had my DS for over a year now and clean both top and bottom screens regularly with a soft lint-free cloth. Sometimes I dampen it with just a small bit of glass cleaner if needed. I admit that there are a few very small light scratches on the bottom screen, but only noticeable when my DS is off and I'm looking closely. Save $5.00 with regular cleaning and careful use!