CRMery is one of the best Joomla extensions I've worked with. It rivals the pricey cloud based plays and puts the data in your control.
Ease of use
Very easy to deploy and use. Some small inconsistencies in user experience but overall amazing! Most users won't need to look at a manual.
Amazing support. Developers you can really reach with answers you can reall y use.
Documentation is available but a bit thin or disjointed. The user docs are more thorough than the admin side.
Value for money
Given the cost of the cloud based, big boys --- and the necessary commitment for any enterprise CRM, Cremery is amazing power/control/value