René Aigner's Sketchbook

[ReneAigner]

Personally, I'd say yes. I mean, it's not necessary, e.g. the girl with the sword on this page was painted on the crappy 15.6" laptop screen, it just feels much nicer. More room for the tools in PS, you can zoom in further without loosing sight of the complete picture... I have a 30" Dell in studio and the transition to the Cintiq 24" was a bit painful. Smaller screen, lower resolution... I'd buy a 30" Cintiq in a heartbeat (or however long it would take me to get the exorbitant amount of money that would cost^^).
I guess the only thing more important than size in my personal preference is the screen type itself, I swear by IPS panels. Good to calibrate, very wide viewing angle...