We've been running a couple of servers with CL for a month or so and found no real benefit. We balance our servers very well anyway and use simple scripts to check for CPU usage and kill processes that hog CPU. While I understand that CL throttles users rather than killing their scripts, the cost isnt really justified for this small benefit alone. Customers that require more resources can be identified without Cloud Linux and even with this product, you'd still want to move them to a less busy server anyway, so they dont complain of their site being extremely slow. If you've got a problem with your servers being overloaded - the chances are that you are not maintaining them correctly. With CL you can probably max out your servers and let it slow down the busier PHP based sites - but this will reduce the quality of service to customers. Really you should be balancing servers effectively so that you dont need a product like that. While I understand it may have benefits under certain circumstances, I dont believe the high cost is worth paying for the minor benefits it brings. Perhaps you think otherwise? I'd be interested to hear from someone who has seen a great benefit from using this product.