Yeah. As well as possible dubious readings, there is all the other stuff too.
Having that thing stuck in you 24/7, God knows what it's doing. Then there are the worries about it not attaching properly, falling off (weather, sweat), pain, it getting in the way during activities, then the fact that you have a big obvious white thing stuck on your arm and all the questions that come with that.
One really big thing i found annoying was the fact you couldn't go back into the meter and edit the notes (carb dosages) etc.
As you can tell, I'm far from being convinced about this thing.