I wont bother going into too much detail regarding the story as thats already been covered but if you try to imagine a really cheap bad horror from the 70's then you'll have it.
Winchester House itself is a relatively unknown haunted house but in the same vain as the Ammmityville house. I don't know whether the movie is supposed to be based around the true events that happened there or not but its respected enough that Most Haunted have actually done an investigation there.
The acting here is beyond laughable. For instance at one point one of the 'spirits' drag the daughter into a closet right in front of her mother while the mother stands there watching and only shows any shock at whats happening when the daughter is actually in the closet and the door slams. Was she not horrified by some ghost actually grabbing her daughter and dragging her from behind for 20 feet? Then you have the supposed 'psychic' who shows no knowledge whatsoever about the spirit world! The SFX look like they were done on your home PC using MS Paint or something lol. The direction and score are all horrible and the script so bad that its almost funny.
I had high hopes for this, expecting a new Ammityville or something and all i got was a couple of non intended laughs. If you are wanting a good horror with a creepy backdrop, a couple of jumps and something scary then go and watch the Teletubbies because thats a damn site scarier and much better acted lol.