Avon, Continental, Dunlop & Goodyear I've all had good experiences with these. I've also had excellent times with Accerlera tyres too, they're a good price and they really do grip well. Tyres I've had a terrible time with are: SUNNY (Scary), Sunew (better of the cheapest budgets), Autogrip (Scary), Clear (Very Scary), Fullrun (Proper brown trouser moments), there's loads more I've had a bad time with too.
Fullrun & Clear tyres being my main cause of concern, one of my 7 Series has at the back one Accerlera PH1 RH side (5mm), and a fullrun HP199 LH side (5.3mm) on the other side (odd tyres I know, but it was direct from a Chauffeur company and they will be changed). Anyway just this morning it happened, the road ahead was clear, little bit of drizzle in the air, but conditions were generally ok, a new Astra was absolutely welded to my arse end, anyway I decided enough was enough and I put my foot to the floor. I got upto 80 MPH on the runway, and the fullrun decided that it had, had enough of accelerating and decided it'd try and fling the left hand side of the car around on me, luckily I caught it just in time, as did the DSC, but it made me think how can they seriously get away with selling these tyres? I should also add this was on a completely straight road and the rear end came round. If you want to buy budgets go ahead.
I'd take a decent branded Part Worn over any budget!