I just remembered, I posted a photo update on April 5th on some Springfield happenings, which was also the same day I got to try Bumblebee Man's Taco Truck and Phineas Q. Butterfat's.
I'm really picky with Mexican food so I just ordered nachos with no toppings, aside from cheese and beef. The chips seemed like they might be better quality than at Gru's, but overall, not much of a difference. I'll try and go for one of the tacos next time. My only gripe with the venue is that it's a nightmare to wait in its queue when you're dealing with typical LA weather. The whole Duff Brewery area is pretty cramped, so waiting in a long line while pushed up against a bright, scalding truck is not my cup of tea. It was, admittedly, my mistake for succumbing to my urge to visit in the middle of the day.
Phineas', on the other hand, is a brilliant addition in my eyes. The venue utilizes these new soft serve machines that allow the vendors to swirl a particular "side-flavor" into chocolate or vanilla ice cream, which is what they utilize to pull off the renowned ice cream offerings at Florean Fortescue's Ice Cream Parlor in USF (notably the Butterbeer ice cream). For my first visit, I went for vanilla ice cream with a cotton candy flavor swirl in a waffle cone. I must say, it was pretty darn good. I'll definitely be stopping by again!
This only leaves Luigi's, Lard Lad Donuts, and Suds McDuff's Hot Dog House on my list of unvisited Springfield venues. Expect a final review after my next visit!
Afterthought: Krusty's "VIP" dining area doesn't seem to be exclusive anymore. I ate in that section with family during my last visit, as did many others, without complication.