an advantage to the WXM over the ecolink, is that if if you utilize the Feed modes of your apex, you can have the MP40 slow down or stop completely during feed mode, and then enter into nutrient export mode for a set period of time once feed mode ends. In addition, there are fewer frustrations with the WXM vs reeflink. Now, with that, both of them more are less are set and forget. The advantage of the WXM is the integration with apex feed modes. Davehead86 is right, if you were to get a vectra return pump, it currently will not work with the WXM, but this does not mean a firmware upgrade at a later date wouldnt incorporate the pump.