When I purchased the vehicle, it seemed a no-brainer to get them. I can't imagine the seat backs would last without them, especially if you load and unload items that require the seats to be folded down. So, I think they are worth it.
DEFINITELY one of the very best accessories you could buy for your Outback. I jumped at the chance to install these (super easy to do btw) and I'm so glad I did. Several furniture moves, doggy play dates, and cross country drives later, I'm positive this accessory paid for itself.
no drilling needed - just punching a hole for the clips.
I put them in mine - and I know from my last outback that I eventually will be loading things in there that would need a sturdier and smoother surface to move across - be careful sliding things over the pins though - as they are known to catch and crack easily.
Some on here know the links to some subaru parts sites that have slightly lower prices than dealers - but check shipping.