Before I begin, I must readily admit that the following is entirely subjective.
I have performed a taste test of Great Lakes Brewing Co's Eliot Ness in a bar-proper hot-rinsed and carefully dried snifter. [note: I used a flinging-like motion to throw the water quite a few times in the end - I just used a basic towel to dry the outside.]
This may not be the most proper pairing of glasses to Eliot Ness, I can't say I know many outside of a few specialty brews, e.g. Kentucky Bourbon Ale carries a recommendation for a snifter. I have not tried a snifter with that beer yet, but I must say it was this thread that led me to try something I had in a snifter for the hell of it.
I had one bottle left of Eliot Ness, and one bottle left of Edmond Fitzgerald, a Porter from the same brewer. This test is subjective due to the fact that I could not properly test by pouring one bottle into a pint glass, and another of the same into a snifter. Full disclosure, the snifter could not fit the entire 12 ounce bottle, but I felt it unfair if the pint glass was not equally full to start. I would only want to do a comparison test on equal grounds.
I must say, I do feel the beer's character is different in the snifter. I cannot argue it is either better or worse than what I've tasted of the beer before. I am not a professional taste tester, and thus I do not have the words to connect to what I taste, and lack a strong background in hops from this or that region, or these species of barley and where they are grown. I know enough to more often than not know if I'll like a new style of beer or a new brewery's version of ones I have typically liked before.
I can only recommend that others take the opportunity, when available, to try some different glasses. I've been long convinced that playing with the ratio of tastes and smells completely changes the overall flavor profile. You notice it when sick, I reckon. When you change how much scent is lifted from the beer, or how efficiently it is delivered, it will balance with the taste sense in a different way. Our overall sense of flavor is not determined by taste alone. Taste alone performs fine, but scent will contribute when available, which is of course most often the case.
I do not argue that flavors and scents appear out of thin air; it is better understood as how all of our senses contribute relative to one another, and how the resulting ratio changes the perceived experience of what we consume. I would argue you can also mentally control it, so total experience may vary depending on the approach and attitude toward the experience. I've experienced the phenomenon of thinking you need to not pause to taste but power through things, and by taking that stance you can seemingly dull certain stimuli.