6x9s are only good for adding volume. They're a complete waste of time for adding more bass.
Would strongly disagree as it totally depends on what you had in the first place!
Don't have them in the Clio anymore but when I did, and in my previous car, they provided a marked increase in bass and volume over the standard rear speakers.
I miss them now but got fed up with the parcel shelf I had to use with them in so back to the standard setup

I still maintain if you don't want a sub they aren't a bad thing, I just wouldn't have them as well as a sub (there'd be no point).
As said just make sure they are setup for just giving you some rear fill/bass rather than pumping out the mids and trebles too much as it will drag the sound behind you.
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