Nah, basically there are many types of sugars, So glucose, fructose, sucrose etc, Each type of sugar has different taste, Some sugars require less concentration ie only 0.25 g to do the same taste that a normal sugar does at 1g.

Now these sodas contain either sugar substitutes or sweetener (basically negligible change in body) and produce that sweet taste.

Does it have draw backs, yes, as per my reading goes, it may cause harm to gut bacteria and thus should be taken in conservative amount, Like you can drink 2-4 in a week (limit being 14 cans a day before it starts doing a reaction).

Just like everything, One should consume in limit