I didn't like the anti-glare screen protector, it made the screen less transparent under regular light conditions.
The N900, aside from being ridiculously thick and heavy, is fine to handle outdoors (matte finish comes in handy), except when you start using MyPaint, draw for a few minutes, and then your palms get reallly sweaty beacuse as you can see in cpumem-applet, the phone's getting pushed really hard.
Uh, back to outdoors, it handles quite well in the 32 C heat in the morning, even if it's OC'd to 750. I never saw it push past 40C battery temperature.