Messages easily flow from publisher or application to subscriber. You can also flow messages from publisher to SNS with an https-like mediator. Amazon SQS is there, so message queue services are also there. The message transports to the service provider such as Redshift, the SQ bucket, Teams, Splunk, or any other message service.

The solution has no up-front costs. 

Messages flow much more quickly than in the past. They used to run a bit late after being published. 

The most valuable feature of Amazon SNS is speed. It's really fast. 

The best aspect of this solution is its simplicity. We just have to create topics and can have as many subscriptions as we want under any topic we create.

The mobile push notifications are the most valuable. Previously, we used to use Firebase Cloud Messaging (FCM) for this functionality. It is a Google service for sending push notifications. We used to run into problems while sending notifications to iOS devices but SNS made it a lot better. I think FCM just added that functionality while we were moving to SNS cause under the hood, SNS is actually using FCM. 

A major advantage of using SNS though is that we can see all the metrics on our AWS account itself, which makes it a lot easier instead of using a third-party service for this particular functionality.

We have found the key feature of this solution to be the simplicity of sending out notifications.

It's a simple communication service that allows us to communicate with customers.

Push notifications are the most valuable. I have mostly used push notifications for my system. Amazon SNS supports all devices for push notification services. It supports iOS, Android, and Windows notifications. 

It provides reliable push notification services. We have queues, and we can track which notifications have failed or had some issues. We can then figure out the issue. We can also debug the issue because of which our push notification didn't reach the end users.

Amazon SNS has SMS notifications as well. Most of the other solutions have only email notifications. 

I am a mobile front-end developer so Amazon SNS has most of the features for the backend. I only need to transfer for the front-end push services.