I use wicked good weekend warrior and found the long burn times make up for the upfront price. It burns almost twice as long as Royal Oak so the back end cost equals out. I haven't gotten any rocks or foreign material in any of the bags I have used.
I used to use Royal Oak but i have gotten mixed results. Some bags were fantastic but you could tell scrap wood was used. Some bags were terrible with rocks, insulation, and scrap wood.
*Weber Mini WSM* *Weber Touch and Go Performer X3* *Sublime Smoke UDS* *Maverick ET-732 * World's Fastest Blue Thermapen **Pitmaster IQ110*