I haven't used that one specifically, but I have a GG&G one that has the standard reticule (circle with a dot in center) and was a little cheaper ($70). It works pretty well, the only problem with mine is that the reticule is ghosting. (there are 2 reticule images in the sight just barely not lined up with each other) But its not bad enough to keep me from using it effectively.
Obviously it's not going to be as good or clear or accurate as the $400+ real ones, but it will probably work just fine.