Well, for what it comes with for the price is the number one reason. It has the ph and temperature probes included. It also is way expandable. I was looking at adding the pod moonlighting since i have no moonlights on my big tank. You can also program the controller on the web instead of just on the device. I also like the clean look of it as well. I read all the user manuals for most of the controllers out there and the reefkeeper seems the easiest to use.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.