I inject as a rule weather it is a contest or for the family. It just makes a better brisket/shoulder/butt (to me). If you are going to enter in a contest, I'd definitely avoid anything that stains.
Traditional Santa Maria Pit
Mini, Small, Medium & Large BGE
Weber 22" OTS & 26" OTG & 18"WSM & WGA
Each wearing custom handles from Marty Leach