This is a followup to a topic I started back in mid-April:
http://weberkettleclub.com/forums/weber-kettles-accessories/is-kingsford-worth-the-price-difference-above-royal-oak/I caught the tail end of Home Depot's Kingsford sale and stocked up on enough to try it out for myself in a number of different applications. At regular prices here, Kingsford is consistently $3 more expensive than Royal Oak for 15 lb bags which can add up quickly and sales are rare.
So here's what I've found:
Hot and fast grilling - once fully ashed over, Kingsford works fine for this type of cooking. It might run a touch hotter than the Royal Oak briquettes and seems to last longer; possibly attributable to the addition of anthracite coal? I typically use lump charcoal for this type of cooking though. Kingsford might come in handy if I were to ever have a large barbecue at my place and need longer running time to do multiple batches of food.
WSM - using my normal technique it worked but imparted unwanted flavour so I'll continue with Maple Leaf briquettes for this use.
Hot and long - given the running time Kingsford seems to have once lit, this is probably a situation it would work well for. The only hot and long application that comes to mind for my cooking would be the Kettle Pizza but I haven't had a chance to use it yet this year so I have yet to test it.
On the whole, I think I'll stick with Royal Oak for most briquette cooking given the price disparity and the Maple Leaf briquettes in the smoker.