I have used one for a couple years, if you use chunks of wood instead of chips it will smoke longer and you can leave the top off the smoke box so you can get more chunks in it.
When I first started using mine, I made the mistake of filling the smoker box entirely and then adding to it again...and in some cases..again. However, after reading tips on here and another board, I started just putting in one or two chunks in order to get just a wisp of smoke. After about 2 hrs or so, you really do not need anymore smoke as the meat will only take so much. You just need to experiment some and see how it tastes. Start off with less then add more if you feel it needs it.
my 2 cents
On days I don't have the time to keep the Bandera fed with hardwoods, I stick the turkey fryer propane burner in it and use a cast iron skillet to burn the wood in. I got my cast iron skillets at Harbor Freight, $10 for 3 sizes I believe I paid. It works fantastic and hold temps on those cold windy days when I HAVE to have some Q.