Instruct: Classify Amazon reviews into positive or negative sentiment
Query: .....If only the lancet worked.....!

...It seems foolproof-But, in my case? It was a waste of money-After *carefully* preparing the lancet, and removing the cap it failed to deploy past the plastic guard-It never actually touched my finger, and can't be reset. A few painful jabs with a pin didn't do the trick, either! Ultimately? All I did was waste money on the kit and shipping-Regrettably? I actually had to shell out a few more dollars for *another.* Let's hope the lancet works on the new kit!