Low-priced tyres

Hello, I would now have to have 4 new summer tyres and think about buying the Nankang NS2, or the Vredestein Ultrac Sessanta in size 235/35 ZR 19. Has anyone already had experience with the “Billigrafen”? The price differences are GEWALTIG compared to Michelin, Dunlop or Continental. Had so far always Contis and Dunlop on it, but was not so enthusiastic.. Had had read somewhere also that falcons is especially recommended for Volvo.. a falcon seen on a Volvo. Drive a V70 D5. BJ. 2006 Thank you for your opinions. PS: and please don’t bring the sayings like: “If you can’t afford reasonable tires, then don’t drive a Volvo!”