Yeah, mine is still on its original shocks and they are doing fine.
Eibach do two kits... the pro kit which lowers by 30mm front and rear, and the sportline kit which lowers 50mm front 40mm rear.
But as mentioned, if you lower using the pro kit (30mm)..... 1) you may end up with a bit of reverse rake, and 2) yours being an s-line you won't notice any drop at all. S-line's are 25mm below standard height so the pro kit will only give you another 5mm drop, if even that.
Basically, if you want to lower your car then you have to buy springs that quote 50mm as the drop, otherwise its just not worth it.
But if you are only going for improved ride and comfort then a 30mm spring is also fine.