A friend who doesn't drink coffee took me there with the premises that it is a queer friendly place with good industrial retail design (two parameters that are essential for our outings). He had no idea about what he put me through.
I had the opportunity to sample the coffee, twice. One Vietnamese coffee (before knowing that they actually have Intelligentsia beans are seriously serious about their stuff). The coffee was decently made, and even with the toning down of the condensed milk, there was something special about it. Moreover, there was something special about the way the barista explained the drinks to the customers (oozing passion and an understated precision), so I went there again next day and ordered a shot of espresso. Now I am going to paraphrase the rest, from another board where I complained about how a local coffee shop ruins Intelligentsia beans; because I don't know how else I could describe the shot, in any other way
I visited Diesel at Somerville, MA and had one of those golden shots with an almost flowery taste, no roughness at all, rather possessing the feeling of licking a really really good chocolate syrup without any sickly sweet aftertaste. All made from a custom Intelligentsia blend, said the barista (was it Black Cat, dunno?). It reminded me of why I was obsessed with coffee a few years back. Now that is a coffee that I would probably take all the attitude for.
Now going through the board, I see that there are inconsistencies of the output at Diesel (which is I guess normal "variance" when we are thinking espresso). I guess it was my lucky day.