I can see the lines on any light coloured background, just easier to see on the white. They're about 1-2cm wide.
I'm hoping it's a defective screen rather than my sensitivity to them. I can see the lines every time I type an email or open a forum etc and it's driving me crazy. This is my first tablet and I'm enjoying its portability but not at the expense of a bad display - especially when it's being trumpeted as the best tablet display yet.
Will call Komplett tomorrow and see what they say. I'm still covered by 14 Day guarantee so I'll be refunded either way.