Excellent product, very customizable but support can be better

The Lightning components are a step forward to good usability for Salesforce. Classic felt outdated and ugly.
With the ability of Lighting components to reconfigure the screens, I can say that helps a lot to rearrange the data and present it to the users the best way possible.
The mobile version could be much better, it feels like just a visor for the web version lacks in my opinion of the usability of a mobile design.

The Professional version relies on its community and its documentation. No chat support, no phone support. And I think for 70+ USD/ user/ month, there should be some of those options available. Finding an answer in the community is not always easy to do. I had to go with a Salesforce developer or administrator to find answers that I think I should be able to find with support.

I think that maybe it is too much for a small organization, where the cost can be a problem. But is really flexible through its API, so a balance needs to be made when weighing pros and cons.
Also, if you are thinking of extending the capabilities like us using its platform, be aware that Salesforce developers are not easy to find, and they are very costly. Consider an alternative or think about extending it outside the system.
It is well suited for mid to big companies that need to manage a sales team, territories, permissions at data level, etc. It is very configurable but can have a steep learning curve for some people, and it is very recommendable to have at least one team member certified in Salesforce Administration.