The food truck scene downtown is pretty competitive, and there is a different truck outside my office a couple times per week. I typically try whatever fare is available that day, but the Wandering Donkey was really just mediocre for me.
I had the Lamb Barbacoa bowl - the meat itself was very tasty, a little fatty and salty, but those aren't necessarily bad features for me. As some other reviews have pointed out, the rice and beans were essentially flavorless - it was also disappointing to me that there were almost no options (ONE choice of beans, ONE choice of rice, etc). If you are going to charge $11-$12 for a burrito bowl (WAY above market price in my opinion), you should at least offer a few different options for the contents of the bowl.
There were 3 salsa choices (aside from Pico and Corn) - the Medium was very hot so I was really glad I did not get the Hot.
For the price and limited options, if the truck was in front of my office again, I would most likely not buy my lunch here again.