1080p = 1920x1080 which boils down to a 16:9 aspect ratio. older monitors will offer 16:10 at 1920x1200 resolution.
for hd movies(1080p), you won't get black bars compared to 1920x1200 monitors. for games, depends on how narrow of a screen you are comfortable with. i think 16:10 looks better than 16:9. maybe it has to do with the fact that the golden ratio is closer to 1.6 than 1.777...
for general use, i think 1080 vertical lines isn't enough. you'd have trouble viewing a full page at times, such as a word document.