Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Nice HD tuner, when it works...

After reading all the reviews for the Samsung SIR-T451 and the Humax HFA100, I decided to purchase the Humax HFA100. The unit is small, sleek, and works well. However, 3 weeks after - the day BEFORE the Superbowl - it started to malfunction. There was no picture. The unit would freeze so that you couldn't change channels or turn it off. Sometimes it made a very annoying high pitch sound. End result, I'm dissappointed that I didn't get to watch the Superbowl in HD. Buyer beware - this one's definitely NOT a keeper.