Without the main control module you are only getting a portion of the adjustments. I think the "Lite" version was designed as a cheaper way to get a second Deus where you could do the actual complete programming with the main module from another detector. It would be nice to buy the CTX without the GPS feature for $400 dollars less as well since so few actually use it,,,,,,same idea but the main control module for the Deus is more than just a feature.
If cost is a big concern , get the Deus without either headset option and plug you own headsets into the main control module,,,,that's what I would consider the basic unit.