Where is the limit to our subconscious mind?

Rating: 7/10 (21 March 2011)

The movie starts as a 'what if' story, turns into a mystery, and then transforms itself into a thriller.
The most interesting aspect of the film to me was its theme, namely the limitless potential of our conscious mind. Is our brain a treasure island full of hidden mental powers? At times we surprise ourselves by being able to recall a seemingly obscure fact deep in our memory vault.
Not a few things in the movie kept me on the edge of my seat: the known/unknown side effects of the drug, the shady haunting man, the powerful secret hanging by a thread, and the unpredictable story line.
The film slightly suffers from some loose ends, though. For example, it could do without the thug, and the murder at the hotel could have contributed better to the story line, if more elaborated.
I wish that the ingredients of the drug were rare and the drug itself was impossible to be recreated.
Overall, the acting was convincing and the special effects weren't distracting, but rather cleverly woven into the scenes.
Its ending was rather lame, IMHO. Why not leave us with some unanswered questions to lose sleep over? Well, I love dark endings, like the one in 'Somewhere carnal over 40 winks'.
Spoiler: The Matrix is mentioned in the movie.