It all depends on your budget and what rig you have.

Do you feel the need for 2?

If so get one, if not don't.

Only you can know this.

I personally love 2. It helps more then you think. I usually use my better monitor for gaming and my tv thats hooked up for twitter/youtube/skype blah blah blah

As Craig said you are the only one who can answer this.

Would you be able to put both to use? Can you mange with just one, it all depends. I know people who have two monitor set ups but rarely use the 2nd monitor, they might drag files to it every so often and thats it and then I know people who have 3 monitor set ups and always have something going on.

Just ask yourself if you would put them to use if not, do with one.

When I built my second PC I kept my old monitor and bought a new one.

I prefer two so I can listen to music while I'm gaming or doing other stuff, so I don't have to keep changing tabs.

I think it's worth it

I agree with everyone else, only you can answer it.

From my experience using two monitors, I think it's great. I throw up something to watch on one and do work on the other. Honestly I'd prefer three at this point, but the multitasking I can do with two is pretty great.

So, I prefer using two monitors. Ones just to limited for me.

I have 2 and I could never go back. I use one for csgo and have teamspeak up on the 2nd one. I also love watch streams on my 2nd monitor whilst browsing twitter, reddit, ttg ect on my main monitor.

But like previously stated, only buy it if you want/need one.

I love having two monitors it helps a lot with working in adobe illustrator and having itunes or a web browser open on the other screen

I think i might just stick with one, I can always just alt+tab out of my games anyways.
thanks for all the replies