From all the reviews i seen, the plastic balls do not effect the spin on the serves. Also its not like there is no spin at all. There is surely spin on it but only less than before.
You need to try it by yourself (plastic ball). it's yes spins well enough on serves and on loops, you see very curved trajectory of the ball on loop, but you returning ball with ease, even with very ease, just place the blade in right place and point the ball to wanted direction, that's it, you got the table
It's totally different from cell-ball game, I won't say that plastic ball slower than cell-ball, but game become more simple, and that not good.