Instruct: Classify the given review into positive or negative sentiment.
Query: Be careful with this product!

I had high hopes for this product, and as I opened and assembled it, I was happily surprised to find that it looked just as good as it did in the advert. Unfortunately, the instructions are unclear as to precisely how to set the timer, which is a bit frustrating. I figured the four digits meant the year, and so set the machine to 2200, hoping to jump forward far enough in time that science will have cured aging and perhaps allowed mankind to begin colonizing the solar system. The moment I flipped the switch, all of the lights turned out, and it was suddenly dark outside. Looking at the clock on my VCR I immediately realized my error (that the machine only moves BACKWARD in time, to the hour and minute set). I decided to get to bed only to find my past doppelganger in bed with my wife. Suffice to say that situation was dicey, and has led to many uncomfortable situations since. My wife, however, is quite pleased.