I am looking at one long term, but would also need to get an XS (or something with more sense ports) as well as setting up somewhere to put the outputs from the testing. The X4 is going to be moving to the wife's tank so I'll have the X10 and XP8 on my tank. I'm full on sense ports now with everything I have at this point (ATO water level sensor, skimmer level sensor, tank temp sensor, leak rope).
Who knows, maybe the Maven will finally be out and I can talk myself into that decision instead lol. Otherwise in a few months I'll probably spring for an IV. I just know whatever I go for is going to be at least one more controller addition of some sort!