From a testing perspective, having a centralized layer to observe API traffic has made it much easier to debug failed test runs. I can see exactly which requests and responses passed through, instead of having to dig through individual service logs. The rate-limiting and throttling plugins have also been useful for load and stress testing scenarios, and the request/response transformation plugins make it easier to simulate different payloads for stronger negative test coverage.

The API security and authentication features are the strongest part of the platform for us. Setting up OAuth, API key policies, and rate limiting per consumer has given us a much tighter grip on who's accessing what across our services. Managing auth centrally instead of building it into every individual API has saved a lot of duplicated effort, and the audit trial for API access has been genuinely useful when troubleshooting or reviewing security posture.

The API gateway and traffic management side of things has been solid for us. Rate limiting, load balancing, and routing rules are straightforward to configure once you get the hang of the platform, and it scales well without a lot of babysitting. The centralized visibility into API traffic across services has made it much easier to spot issues before they become bigger problems. Onboarding new APIs into the gateway is fairly quick once the initial setup is done.