Well I've tried the screen protector. 1st time I put irt on it seemed like it was about 2mm too short, then realised I'd put it on with some under the top lip. Replaced it in correct place (a perfect fit) and used it.
I found the devise less responsive with the screen protector on. Also difficult to write on the screen as there was too much friction. Also when I used my fingers I kept getting marks with reflected in the sun.
All in all it seemed far better without the screen protector - I've ordered a decent case instead!