Recently there have been a number of reports of gastrointestinal distress coming from Colorado and Montana. I do not know whether they have a look-alike species that is not good to eat or have an unusually large number of individuals who cannot tolerate Leccinum species. The symptoms can be very severe vomiting with diarrhea. Individuals can be gassy, dizzy, stiff and sore. Recovery can sometimes take as long as 5 days.
Most poisonings are from consuming raw mushrooms, but some come from cooked ones as well.