I'm fairly new to drum smoking, but have been smoking for a long time. I ruined my meat at the last competition by using a diffuser (no electricity at event, so I used my new drum). Cook times were way off even though I had a probe on the grate level, and the analog thermometer was 50+ degrees off at times. I took the diffuser out and it fixed everything. It doesn't burn the food like you would suspect it would, and the drum evens out the temperature pretty well. Mine measured almost exactly the same temperature on the side of the barrel where the analog thermometer is as it did in the middle where the digital probe was. I'll probably never use the diffuser again, or if I do I'll modify it to have more air passing through.