I intend to change my Zone VI cold light head with a Zone VI VC Cold Light head on my Omega D5XL. My question is which compensating timer to buy with it. It seems my three choices are a Metrolux Lamp Controller Kit, Zone VI Compensating Timer and RH Designs Stop Clock Vario. Other than price, does anyone see any reason to go with one over the other? Anyone have any positive/negative feedback on one or the other in terms of performance, accessories/extra functions, reliability, customer service, etc? Thanks much.