I like that we are able to access the JAMF portal from any device on our network. This is particularally helpful when we are using JAMFTools on the mac, and can create and manage policies on the windows web browser. I like that we are able to use smart groups as criteria for smart groups. By doing this, it makes it easy to push and categorize the scope for various policies, enforcing what groups can get what software
It can be INCREDIBLY slow. Because of using multiple servers, clients, etc, sometimes you have to be patient when running large jobs and sending large items. Because we use JAMFTools on our macs, there are several accounts we must use. JAMFComposer can often be picky about what it wants to and doesn't want to package, and how it works. It assums you want to do a before/after image install, but this is not always the case.
Be wary as to device counts, as it may get pricy, as I believe we pay per device.
We are able to manage 303 Macs all from one console / config application. Because of this, any one of our support staff members can push policy to the macs using JAMFRemote, and see results and logs quickly. We are able to put in different maintenence scripts and policies for users as well, such as mounting network drives, adding printers, etc. This makes it easy for USERS to troubleshoot.