I've only been on a few days and already experienced the flat soda effect... that's the whole reason for soda.. I like the fizz... not cool.
My doctor warned me about the tingling, it's a sign of low potassium, so she said to start eating more bananas... so no tingling yet.
Also consume a lot of water to reduce risk of kidney stones...
So far I've only experienced the flat soda that I know of..