I will definitely not consult a medium. I have friends who do so and take advice from the 'dead'. I think that its just a con job. Don't forget that spirits have clairvoyance and its dangerous to believe anything these mediums convey too. BUT if its a certified and authentic oracle in the monasteries and the Dharma Protector giving blessings and messages then its definitely a YES. I have seen the oracles on videos and the feeling of watching it is just awesome.
Dorje Shugden Oracle taking trance at Serpom Monastery's Grand Opening (The video's owner prevents external embedding)
Mediumship
Mediumship is defined as the practice of certain people—known as mediums—to mediate communication between spirits of the dead and other human beings. While no evidence has been accepted by the scientific community in support of the view that there has been communication between the living and the dead, some parapsychologists say that some of their research suggests that such communication may have taken place. The practice is associated with several religious belief systems such as Spiritualism, Spiritism, Espiritismo, Candomblé, Voodoo, Umbanda and some New Age groups.
There are several different variants of mediumship; the best known forms are where a spirit takes control of a medium's voice and uses it to relay a message, or where the medium simply 'hears' the message and passes it on. Other forms involve manifestations of the spirit, such as apparitions or the presence of a voice, and telekinetic activity.
Attempts to contact the dead date back to early human history, with mediumship gaining in popularity during the 19th century. Investigations during this period revealed widespread fraud—with some practitioners employing techniques used by stage magicians—and the practice started to lose credibility. Nevertheless the practice still continues to this day, and high profile fraud has been uncovered as recently as the 2000s.
Psychic senses
In Spiritualism, psychic senses used by mental mediums are sometimes defined differently than in other paranormal fields. A medium is said to have psychic abilities but not all psychics function as mediums. The term clairvoyance, for instance, may be used by Spiritualists to include seeing spirits and visions instilled by spirits. The Parapsychological Association defines "clairvoyance" as information derived directly from an external physical source.
Clairvoyance or "Clear Seeing", is the ability to see anything that is not physically present, such as objects, animals or people. This sight occurs "in the mind’s eye". Some mediums say that this is their normal vision state. Others say that they must train their minds with such practices as meditation in order to achieve this ability, and that assistance from spiritual helpers is often necessary. Some clairvoyant mediums can see a spirit as though the spirit has a physical body. They see the bodily form as if it were physically present. Other mediums see the spirit in their mind's eye, or it appears as a movie or a television programme or a still picture like a photograph in their mind.
Clairaudience or "Clear Hearing", is usually defined as the ability to hear the voices or thoughts of spirits. Some Mediums hear as though they are listening to a person talking to them on the outside of their head, as though the Spirit is next to or near to the medium, and other mediums hear the voices in their minds as a verbal thought.
Clairsentience or "Clear Sensing", is the ability to have an impression of what a spirit wants to communicate, or to feel sensations instilled by a spirit.
Clairsentinence or "Clear Feeling" is a condition in which the medium takes on the ailments of a spirit, feeling the same physical problem which the spirit person had before death.
Clairalience or "Clear Smelling" is the ability to smell a spirit. For example, a medium may smell the pipe tobacco of a person who smoked during life.
Clairgustance or "Clear Tasting" is the ability to receive taste impressions from a spirit.
Claircognizance or "Clear Knowing", is the ability to know something without receiving it through normal or psychic senses. It is a feeling of "just knowing". Often, a medium will claim to have the feeling that a message or situation is "right" or "wrong."