Bill Graf--and Sandra, the other half of this team--were great to work with. They dove enthusiastically into the project (an abstract circuit board mural for my office), asked lots of questions to figure out exactly what I imagined for the space, researched circuits, came up with several designs, redesigned when I asked them to make a change, and ultimately executed the final design beautifully with an attention to detail I had not anticipated.
When Bill first responded to my Thumbtack post, I wasn't sure if he was the right choice--not because his work wasn't impressive, but simply because the mathematical nature of my project seemed very different from his portfolio--but he proved to be incredibly versatile, and I'm so happy with the outcome.
I'll also add that they worked with me on scheduling to fit the needs of a busy office. Not to mention, he and Sandra are super enjoyable, nice people.