It's easy to use as it supports both Kafka & RabbitMQ protocols without any extra configuration effort required by users once its installed properly with appropriate plugins provided along side each protocol (ex : kafka plugin needs additional maven dependency).
The UI of enmasse isn't that great but works just fine when you get used using CLI tools available via REST API endpoints exposed through their SDKs. We were looking at setting up our new microservices architecture which involves multiple APIs consuming messages from various publishers over either AMQP/KAFKA queues within AWS environment. Our existing applications are written only supporting Kafaqeque so we needed something equivalent working well under Amazon ECS services too since there was no need of moving those apps outside EC2 environments yet keeping them secured behind firewall.