Sure there is abit of benefit from a solid mount in terms of suspension "mushiness." But the big sell point of pillowballs is camber adjustability. However, stock we have a HUGE range. You would need to be doing something hella funky to need that extra little bit of added range. Also, if your mounts are new they shouldn't have any mush in them at all. Stock they are pretty beefy.
If it's an issue of getting pillowballs or not, I'd just as soon go without them. The new coilovers will have new mounts anyways. I personaly would not pay for something I can adjust stock.
It's not like a civic where they can't adjust crap if they drop acouple inches.