Don't shoot me for saying this...
But I think Nankang's are ok. LOL.
They're really cheap though.
But before on my Mazda 626 I had Kenda, which lasted a whole year, didn't notice any wear, despite having gone on alot of road trips.
The Nankangs on my Vectra feel good. Only had them for a month, so time will have to be the judge of whether they'll last long or not.
I've seen some good brand tires that wear real quick.