bung hole and 3 nipples worked pretty good for me. The only issue I had is the lump had to be dry. If it absorbed too much humidity, it was very difficult to get the temp above 220.
bung hole and BBQ Guru is easier (can set it pretty much anywhere from 175 to 400) - but is kind of overkill (but sometimes overkill is a good thing). Not sure if there is a hot spot over the bunghole or not - but can always rotate the lid.