I would give them a miss mate. Some would rate them well but much depends what they are rating them against? as one can only make comparisons with tyres they have used before
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I believe they only have street composites in the them. For "proper grip" you will need tyres developed for street / track.
I'm on the new Toyo R1 Sports at the mo which are ok but no where near the best.
The Michelin Pilot Sport PS2 is the most technically advanced road tyre at the moment developed using 7 different composites and were the best tyres I had used until I used the Hankook Evo V12.s.
The V12's are in a league of their own and can still be picked up for about £ 100 per corner.