I have them, bought from Halloween City last year. The only difference between the two is GR's has molded hands on the dummy instead of fabric doll hands and is $20 more. Audio was the same. I have a haunted carnival/circus in the works and love it for that. I think the timing between the two is nice. If you have little kids around though, keep them away from them so they don't play with them and dislodge the little connecting wires you need to have in place for the interactivity.
I think Halloween City & sister company Party City had an exclusive on it last year. They don't have it listed on their sites this year so maybe GR is the only place carrying it this year.