Smartwatch Apps: How useful?

Hi,

How useful are most third party apps to you on your smartwatch?

Personally, outside of Twitter, I have no other 3rd party app. The first party apps for fitness are more than enough to cover my needs.

What about you all though. Do you think most people with smartwatch are simply happy with the ones that come installed?

Please help.

I didn't find the right solution from the Internet.

References:

Thanks