I put 4 on my pre-faclift Cupra (ie 16" tyres) and as mentioned above after scrubbing in they're really good. When I first had them fitted though I was half thinking of taking them back as they didn't seem to grip at all well, but that was partially because they were brand new so probably had release agent on them, and partly because Micheldever left one of them overinflated to about 45psi!
Coming from Eagle F1 GSD3s on the front and OEM Pirellis on the back, they feel pretty similar to the Eagles in the dry and a whole heap better than the Pirellis. In the wet they're good but I don't think quite as good as the Goodyears.
Check the Eagle F1 prices though before you buy, mine were about £40 difference for a set of 4 which was just enough to sway the decision, but if it was only a fiver a tyre next time I might go with the Eagles again, unless the Falkens prove to wear significantly better than the Eagles did.