“Worth” is a very subjective term. The iPhone X is drastically different over your iPhone 7. But the best recommendation I can make is physically testing the iPhone X in the store if you can. Otherwise, if you do decide to upgrade, you have 14 days through your carrier likely or Apple.
As a 7+ user who moved to the X, I'd say it isn't worth the extra dollar, but if you can afford it then it is a good upgrade.
It feels great and the new gestures feel a lot more natural. I donated my 7+ to a family member and when I use that now, the home button etc just feels clunky.
I'd say it's only worth it if it's not going to stretch you too much financially. It's good, but not a must have.