Before Zoom, we conducted our recurring client meetings with phone calls and used another (expensive) product called Join.me for screen sharing. Now we instead use Zoom for both the "meeting" part with audio and video participation by the attendees as well as for the screen sharing part of the meetings. Zoom's integration of the interpersonal part of meetings as well as the screen sharing part make it much more effective for us for such meetings. There is something more powerful in video meetings, a very human effect that helps to solidify and maintain the personal relationships that we have with our clients.
With Zoom we can both SEE and hear the other person(s) with whom we're communicating.
The screen sharing tools in Zoom make it much easier for everyone to share their screens, compared to Join.me which makes is mostly easy for the presenter to share their screen.
I participate in a growing number of online video "hangouts" in which many participants share ideas and help, and the tools in zoom such as screen sharing and chat tools make it easier and more effective for the participants in those group meetings.
Zoom's onscreen controls that appear during screen shares frequently end up being in the way. While it's not hard to move them manually with the mouse, it would be nice for there to be an option where those controls might automatically move out of the way when the mouse is moved such that it's hovering over them.
So far, we have not used them to initiate meetings. We have been invited to conversations which I speculated were probably being conducted in Zoom Rooms, though. In those situations, for us as participants, we were very satisfied.
Well suited: just about any meeting where the participants cannot be physically present together in one place and where there is high-speed internet access available.
Not well suited: none, except in cases where high-speed internet access is not available for video and screen sharing. Even then, though, you can conduct audio conference calls between two or more people calling in to Zoom.