I have worked with Axway and Microsoft.

We had found a solution, and we still have that solution, which required the use of an API gateway. We wanted some programming logic to be programmed at the API gateway level. At the time the college chose API Gateway.

That was something we wanted to do, but unfortunately, we desired greater flexibility in terms of our ability to program and wanted to make the best decision, and we chose Apigee, not Tyk or AWS. Apigee provided the best support for that flexibility.

Apigee requires a massive installation, a very bulky installation, which requires a significant amount of maintenance, overhead, and cost. 

The reason we didn't go ahead with the Apigee was that it was becoming very expensive, in terms of license and maintenance costs, as well as setup time. 

We tried Tyk, and a  couple of our client's competitors are already using Tyk, and they are using it pretty extensively. 

When it did not meet with our needs in terms of being able to customize, we looked into AWS API Gateway, which supports that through AWS Lambda, a serverless function, but it has limitations in terms of certain hardbound limitations, such as an API timeout of a maximum of 30 seconds or 10 seconds. I'm not sure what it is. It was also unsuitable for APIs, particularly external APIs that take far too long to respond. As a result, we did not proceed with any API Gateway. Instead, we made use of AWS AppSync. AppSync resolved two of our issues. One is solved by an API gateway, which allows you to connect to any number of data sources over the internet.

It also allows you to have Lambda functions, which you can customize and use to write any custom logic you want in most modern programming languages. Third, because it provides graph scale endpoints, it helped us save a lot of time on our backend development.

We did not switch products from what we were using after evaluation. We had hoped it would help us scale our options for deployment and reduce costs.

I used Kong at one point but it was quite some time ago, so I do not have recent experience with it.

We have used our own API management system in the past, but we decided to switch to Tyk.