I had the sportlines on my last leon and it sat perfectly. I could not get away with the ride though, even on 17's. It could soak up the bumps no problem, i could even take the speedbumps at 30mph. But it just felt too bouncy.
Early on the sportlines were giving some uneven drops on the Leons too, with the rear being too high which i cant cope with it makes me cringe like fingernails on a chalkboard. This seems to be sorted now though.
I would love a 35mm drop like the sportlines but im going to stick with a 20mm drop for practicality. And the ride quality needs to be OEM as I'm a fussy fecker.
Here's a token pick of the last Leon with Sportlines;