Ive got the RKE. Right now it's not more than a glorified timer for my use. Although its working the lights, chiller and some in tank pumps, it offers a ton of upgrades. Ive got the Temp probe with the SL1 and I have the SL2 but DA is having a hard time shipping out salinity probes. So right now not using it and probaly will have to pick up another brand salinity probe. Bought my system at Champion Lighting and supply since they offered 10% off which saved me almost 100 bucks. No one else offered that discount.

Overall...i like it so far