I saw a several years old thread on this smoker, but it was very brief. I just acquired one of these and have questions. 1. what are some experiences with this smoker? 2. Is the water tray a must? I tend to smoke without water as I've seen no major benefit, but I've heard it's a must with this unit. 3. Has anyone had success using wood chunks vs chips? The manual says only chips, but previous experience with vertical propane smokers was that chinks worked better. That's all the questions I have for now. Look forward to everyone's input.