Someone has recently posted that interview ... it could offer a good synthesis of pov ... http://www.rangjung.com/authors/tulku_urgyen_rinpoche-interview.htm
Q: What is the basic outline of practice according to the Dzogchen path?
Tulku Urgyen Rinpoché: All the Buddha's teachings are contained within nine gradual vehicle of which Dzogchen, the Great Perfection, is like the highest golden ornament on a rooftop spire, or the victory banner on the summit of a great building. All the eight lower vehicles are contained within the ninth which is called Dzogchen in Tibetan, Mahasandhi in Sanskrit [and the Great Perfection in English]. But Dzogchen is not contained in the lowest one, the shravaka vehicle. So when we say "perfect" or "complete" it means that all the lower yanas are perfected or completely contained within the Great Perfection, within Dzogchen.
Usually we say that Dzogchen, sometimes called Ati Yoga, is a Dharma tradition but actually it is just the state of one's mind, basically.
When it comes to combining these following two points into actual experience, we can use the statement of the 3rd Karmapa, Rangjung Dorje, "It is not existent as even the buddhas have not seen it." This means that the basic state of mind is not something that exists in a concrete way; even the buddhas of the three times have never perceived it. "It is not non-existent as it is the basis for both samsara and nirvana. This is not a contradiction, it is the middle path of unity." Contradiction is like having fire and water on the same plate. Its impossible. But that is not the case here. The basic nature is neither existent nor non-existent - these two are an indivisible unity. "May I perceive the mind nature free from extremes." Usually when we say "is" it contradicts "is not." And when we say "non-existent" it contradicts "existent." But this middle path of unity is devoid of such contradiction. When it is said "to attain the unified state of Vajradhara," that actually refers to what I discussed here.
This unity of being empty and cognizant is the state of mind of all sentient beings. There is nothing special about that. A practitioner should encompass that with "a core of awareness." That is the path of practice. Again, "the unity of being empty and cognizant with a core of awareness."
The special feature of Dzogchen is as follows: "Primordial pure essence is Trekcho, Cutting Through." This view is actually present in all the nine vehicles, but the special quality of Dzogchen is what is called "The spontaneously present nature is Togal, Direct Crossing." The unity of these two, Cutting Through and Direct Crossing, Trekcho and Togal, is the special or unique teaching of Dzogchen. That is how Dzogchen basically is. That's it.