Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Buyer beware!!!

As I am writing, my 120GB WD hard drive mounted in my ADS firewire drive is clicking away. I am on my second replacement. The controller boards on these units are faulty.I'm a computer system integrator, and I have never seen a name brand peripheral, fail as this one does. Search the internet, and you find many similar experiences.ADS has been known for making excellent and affordable firewire cards, however there external firewire drives are another beast all together. Buyer beware!!!