Brandon,
As you may have noticed on another thread I use the reef keeper units which work great. Nick from digital aquatics sent me a preproduction RK2 unit that I tested for about a month. The Ph control and MH temp control are great features for a reasonably priced unit. Also I hear through the grape vine that data logging could soon be a feature. It is not as feature rich as the Aquatronics or Neptunes but for the price it can't be beat. For ORP control I use one of the REDSEA units. By the way the quality, looks and usability of the unit I tested was top notch. If you have any questions please post.
John