Nintendo DS touchscreen: Hows it holding up?

I've been using an exacto knife for greater precision. It's improved my scores a bit and so far the screen is holding up fine, though I have accidentally cut myself a few times. I'd say the blood is a bigger problem than the scratches. YMMV..
 
Mine is fine, but I've been taking excessive care of it. Had trouble with a few of the feel the magic mini games because I didn't want to press too hard on the screen. :lol
 
Does the touchscreen have varying levels of pressure sensitivity? Or is it simply an ON or OFF type thing?
 
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