Looking at the many Mobile Device Management systems out there, it doesn't seem that any one of them have it all.
Sure, some of them do a particular function very well, but there always seems to be something lacking with the whole package.
When it comes to MDM, I am definitely thinking about more than managing the device. Managing the identity and protecting the data are equally as important.
The following diagram is put together by Microsoft, so there is an obvious bend to it, but it clearly shows how each product ranks. At this point, it looks like EMS has a complete package and at about 7 bucks per month, its attractively priced: