more info would help

how are you getting to paris?

where are you going from amsterdam?

you could get a triangle fare on AF/KL, ending up with the last leg AMS/PAR

(that you might miss due to train delays to schipol)

the AF might be cheaper than U2 if you plan in advance with a saturday stayover (i.e. AMS/PAR the following week)

but you were asking about experiences- U2 is ok, not great, not terrible

the seats are tiny (but i'm large) and the planes feel cramped- but i prefer to fly club class- except ORY/GVA where U2 was $80 round trip including taxes and AF was $800 for the same trip!!

but for an hour on board i managed

paris/berlin is closer to two hours on the plane