I've been to the Busters truck a couple of times.
The first time I went I got the lobster roll, as I was quite excited about it. (as I love lobsters rolls). It is tasty, but it is quite small. This makes sense as lobster is not exactly cheap. It comes with a pickle and a bag of Miss Vicky's chips. This is needed due to the size of the roll, and I am glad they understand this. The best part of the lobster roll though is not the lobster itself, but the buttery bun they put it on. I have also taken part in the shrimp tacos there, and they were good and more filling than the lobster roll...
Overall, the product tastes good, but because it's not a portion I can feel full on it's not a place I would frequent regularly. I have opted to stick to making my own lobster rolls... but for those of you who don't want to go through that hassle, this roll is at least better than what they offer at 416 Snack Bar :)