I have a Master Built I bought at Lowes years ago. I was using a charcoal unit sort of like yours. I burnt the bottom pan out of it. I went to Lowes and tried to find a propane unit, no joy. I saw the Master Built electric one that looks like a small Dorm fridge. I figured if I didn't like it I could return it.
I have had it for 5 years or so now and love it. I set the temp and time I want it to work add meat veggies etc, shut the door and walk away.
I have a pellet stove as well, but I don't feel it smokes the meats as well.