Nothing wrong with them?
That's the problem with tyres, if you don't need to brake hard, take evasive action, drive through a monsoon etc etc to find out just how good/bad they are.
Sheet tyres can feel absolutely fine in day to day driving, it's when you have an emergency situation that a tyre shows you whether it's good or bad.
Personally I would never even bother to look at a car which has had crap tyres fitted, if the person can't be bothered to fit decent tyres can they be bothered to use the right oil, get their car serviced by someone competent and so on?
Considering that Event tyres get crappy reviews even on tyrereviews I'd steer well clear.
http://www.tyrereviews.co.uk/Tyre/Event/WL905.htm
The GL699 reviews are epic
http://www.tyrereviews.co.uk/Tyre/Event/GL699.htm
I'm sorry, but "there's nothing wrong with them" ie, they didn't explode isn't a good enough reason to buy cheap crappy tyres. I had some Tigar's on my 406 when I first got them, worst tyres I've ever had on a car and they get sacked off quickly.
You use Vredestein snowtrac 3's as an example of how you don't need to buy premium tyres for good performance, but the difference is that they're mid range and ADAC tested them and found them to be a fantastic tyre, I guarantee that if you find Event tyres on the ADAC site they'll be in the "Forking hell, don't buy this crap" or "These tyres are crap, but not absolutely massively dangerous" sections.
On the subject of tyres, it's raining cats and dogs outside and there are massive puddles, running water and so on..... were my Conti TS850's bothered? Nope.