Introscope is definitely an elegant tool for Application monitoring and diagnosing performance issues especially in the Java space. 'Worth the cost' depends on how much the company is willing to invest. Keep in mind that you do need powerful hardware if you plan to monitor with hundreds of agents, thus adding to the cost. Recently several new players in APM market have emerged - some of them actually appears to be somewhat successful, such as dynatrace, appdynamics etc. One thing I like about Introscope that I have not found in other tools, is the powerful EPAgent, which virtually lets you monitor anything. Get a couple of vendors to do POC on your environment, review the costs, present it to the management and see what happens.