Good topic for an exbeeriment.
The results are pretty much as I would expect and the commentary regarding some slight differences in flavor and mouthfeel seemed on par. I have definitely had pumpkin beers where the use of pumpkin is noticeable (Uinta Punk'n as theDarkSide notes) and others where it is not.
I have a mix of roasted pumpkin, butternut squash, and sweet potato currently sitting in a fermenter of an amber based beer. I am curious as to how or if this will come through in the beer.