my gigabyte is great... but i bought the one without a fan... so am having some heat issues... but performance wise... no problems! Though their customer service is shocking! I made an enquiry about the heat of my card and it took 3 weeks for them to get back to me... and even they werent helpful... but as i said apart from the heat my oc'd card is working fine!
dabs dont make their own products.. dabsvalue ram for instance is made by matrix
from what i can tell (based on the picture shown and the manufacturers code given) the dabs value card is actually made by inno3d http://www.inno3d.com/products/geforce6/6600gt.html
i dont know what their cards are like! but £115 is pretty good for a 6600GT.