It highly depends on what you use your bike for. A grocery-getter/commuter is incomplete without one. OTOH, a full-on racing bicycle would be handicapped with that extra weight. Figuring out which end of that spectrum you are on will probably give you your answer.

If you want a bike prop, with little weight penalty, you could look into a Click Stand. http://www.click-stand.com/

I haven't used one, but I can see the utility. I'd be afraid of losing it, actually.