Batts,
Yep, used to work on them all of the time. 2 years in a row without a desktop, only laptop with multiple screens. Sore neck for sure, and not only that, I grew too comfortable with resting my left arm/wrist on something so now that I've converted back to desktop, my left arm drapes over my desk all of the time.
I had a really nice Dell laptop, which incidentally, Israel airport security broke, heh.