Agency or folks dealing with Cross-Sectors - Log in ONCE and access all area across all brands.
If you are an agency - need I say more....

PROS
Login ONCE - deal with all brands!
Sectioned into logical flow.
Each sector has clear process and access.
Complex abilities and functionality with a pretty clean UI.
Lots of Help/How-to in relevant areas so you don't need to go looking.
Excellent live support and CRM flow through options
Ability to provide restricted access to work partners/teams
Has replaced six (6) programs we currently run for CRM alone (for varied sectors and functionality - we tested and made full use of the free version)
Free version with no BS hard-sell, try, ask, try some more and friendly support.
Use their own product!
Listen to user input - from the perspective of a user.

Notes:
Complex abilities, time to setup (not really a con but you need to get a grasp of flow)
CRM - live interaction, requires you to be logged into your dashboard and on the conversation panel or no notifications arrive (live help folks waiting and you don't know)

CONS
Clicks - as mentioned a few times, some processes require numerous clicks to achieve a single outcome.
A few areas have potential for "danger" clicks - delete, remove etc (lost a popup and all data associated with it, mistaking X for close not delete)

Super stoked.
and did I mention you login ONCE to see all brands/interaction