At no additional price, not using SecureX on top of your other Cisco Security products just wouldn't make sense.

Cisco SecureX enables our customers to gain additional insights from the products they are already utilizing at no additional cost. Especially for companies using several security solutions across their environment, SecureX offers a variety of invaluable features, strengthening their security posture. The way it just ties in with both the Cisco Security portfolio and best of breed 3rd party products makes it really easy to move from deployment to active usage and even customers not actively handling their own incidents have enjoyed the easy to do investigations that are possible through SecureX. And it just gets better with every type of telemetry offering its data to it. I'm looking forward to see what Cisco has in store for SecureX in the next couple of years, especially looking at XDR.