Eibach are the only ones I know of with a taller spring. 30mm lift. They transform the DS very well. Keep in mind there is only 100mm of extension on the DS suspension to start with, so anything more will make it unworkable ( with the springs I hit the bump stops far more offroad, but the extra clearance is great).
Spring cost isn’t huge but installation costs are ( rear suspension needs dismantling) - you will see old posts on this forum about it.
If you have installed these, have you noticed any issues with alignment? I bought the Eibach Pro lift kit, 30mm. I took it to an offroad shop to install, and they mentioned they're not sure what would happen with alignment until they install it and adjust the camber? I think that's what he said. Anyways, he said it depends if the lift would "max out" the ability to adjust the wheel alignment and it may make them go "positive". If the lift did cause that, it would cause fast, uneven wheel wear. Which would result in worse handling and having to rotate more often.
Anyone have experience with this, or know if it is an actual concern?