What do you like best?
They have a lot of reports that can help to understand usage, or help with compliance with rules or policies.
You can easily browse other users data, and change permission or owner on files. Imagine you have an employee out for a month, and the project needs to go. You may have a manager asking access to a very important files that the employee was working on.
You can set "Rules" for monitoring, like "files shared outside of the company" with some actions, like "need approval". May be useful
What do you dislike?
The UI is very ugly, and slow. I understand the superheros things, but the UI keep loading. The file ownership transfer crash all the time, can't get it works.
Search and sorting files based on sharing policies is a pain. Ley say that you have 3 folders with 100 000 files in each. Someone share the 3 folders outside of the company. Using the report, you will get 300 003 items that are shared outside of the company, and very, very hard to get where it comes from.
Also, impossible to get a list of "outside email" that files are shared to. I would like to review this list, but can't get it.
Some reports crash.
Recommendations to others considering the product
I will evaluate other options since I'm not really satisfied of the "overall" gPanel. Be sure what you are looking for when using one of those softwares. gPanel has a lot of very good features, make sure it fit your requirements, or it won't be worth the price.
What business problems are you solving with the product? What benefits have you realized?
With Google, security is not a priority, meaning that you need to take care of it on your own. Example, Google don't do backups, so if someone delete a folder, all the file "not owned by them" won't go to trash, but orphan files. You're screw.
With gPanel you "add" some features and securities to your unsecured Google Apps.