We couldn't live without one...well, my Korean wife couldn't live without one!.
We got a fancy one, that polite speaks to you (in Korean, of course), but is also one of those fancy new high-pressure ones, so that you can 'turbo' cook regular rice, but also can do GABA rice, brown rice, etc...and it'll keep the rice reasonably fresh and warm for 2-3 days, depending on the rice. (We make our own mix of white + various brown rice and it'll start to struggle on day 3..white rice only, easily 4 days)
It also depends a lot on what type of rice you are cooking..if you're mainly cooking basmati rice, then it's not worth buying a Japanese/Korean one and you can probably get away with a 'regular' one. For Japanese/Korean style rice, I would get a Japanese/Korean rice cooker. They do cost a lot more, but you get what you pay for.