Just got done spending two days with the Oregon. On road and off.
The display is NOT as bright as some of the other GPS's out there, but it is VERY readable. I used it driving into the sun, sun at my back, in the woods etc etc.. markbvt is right, its not an issue especially if you have it plugged in.
The touch screen is AWESOME.. 300 miles into it and I have nothing but good things to say.. Wire it up, and you will be happy. Otherwise you will be buying batteries.
Markbvt, thanks for your awesome posts on the Oregon.. Without your support of the Oregon I might have gone a different route. I am over 40 and the larger display is much more usable for me.