I have an original Maxspect Gyre XF150 - it was the first one one they made, large size. Paid $300 from Bulk Reef Supply. This has the old controller with it as shown on the link below. Max Flow 5000gph | 50watts | 50-800+ gallons http://www.coralvue.com/maxspect-xf150-gyre-generatorHas worked great ever since I installed it. I am going in a different direction and no longer need it. $75.