I can give you my personal opinion, but don't be judged only with it, you should decide on your own. Demo accounts (in case it's good). are the same as real trading with only one difference - you don't risk your real money. However, there are both advantages and disadvantages.
Reasons to choose trading with demo-account:
1. That's with no risks, you don't risk anything, as you don't need to make deposit instantly.
2. That's easy to start
3. You can test a broker
4. You can test your skills
5. You can test different strategies
However, there are some disadvantages, that's true:
1. That's create feeling that trading is a game
2. You can get used to trade with no risks
So just judge all pros and cons, by the way, I suggest you to try trading with demo, at least for some days.