Maybe I can help Hayd350!
I'm running 20mm spacers front and 25mm rear with 25mm drop on coilovers.
The difference to stock setup is a far more stable and handling based ride, yet not really any more uncomfortable than stock suspension.
At a 25mm drop I can navigate most potholes and bumps, though I have to stay away from high speedbumps and multi-story car parks.
Hope that helps somewhat!