I think that @Dave44 had accurate comments in regards to the improvement in accuracy?
As I read Dave’s comments, his largest complaint was from his personal experience with the older Enlite sensor which clearly had a lower level of accuracy then the newer Guardian sensor.
Diatribe has the following information which seems to be in line with @Dave44 saying the accuracy of the Guardian is less then 25% better then the Enlite? The quote below says about 20% more accurate. Almost the same thing as I read it from a numbers point of view.
"Data presented at ATTD suggested that Enlite 3 is about 20% more accurate than the current Enlite – an average error of ~11% (Enlite 3) vs. ~14% (Enlite) – which should translate into fewer false alarms and a better automated system. "
[Name of new sensor originally going to be Enlite 3 but then changed to Guardian 3. Same sensor - just name change. But potentially confusing.]