I used to be the Cobb stones all the way until last trip when we just used firelighters and standard charcoal. Apart from taking longer to heat up to cooking heat it works exactly the same for a fraction of the price. Cobblestones v convenient for weekend trips though.
My Cobb came in a special offer set with all the different pans. The frying thing is good for pancakes and is used more now my standard rack has rather a lot of crap stuck to it. Firelighters and briquettes every time for me apart from picnics.