I can access my corporate contacts and calendar on my device and it let's me interact with company resources from outside the office which is kind of a necessity for my position.
Also, it makes it easy that I do not need to enter all the CalDAV and Exchange details in personally.
It is very hard to get it working. The first time, I had to install and uninstall it on my phone about three times, having to restart after each uninstall to finally get it working properly.
I had forgotten all about it, until I bought a new phone.
Also, every 45 days, I have to change my password, which will invalidate the profile installed on my phone, and I have to reinstall the MDM profile manually. I do not know if this is a setup mistake on my company's part or if it is a faulty software issue, but it is just a nightmare.
I would recommend exploring other options first. If you just need to get your email accessible externally, consider exposing an IMAP endpoint. If you just need your calendar, consider using CalDAV. It will add a lot of hassle, and many employees are just not willing to install additional software on their phones just to have access to their corporate data.
I can now be in contact with my colleagues on the go, and this has increased my availability by far. I now am able to view my work schedule from home and plan accordingly, which is kind of nice.