Instruct: Classify the given review as either positive or negative.
Query: Malfunctioned within two weeks...had to return it.

I did some research and noticed several units that looked like they all had the same design...I thought they would all be the same so I bought the most economical. I received the unit and it worked fine for the first few days. Actually the clips inside the cover were broken but I thought it wasn't a big deal. After the first couple of days, the machine started emitting a foul smell like something was burning but I thought it would go away after a few days. It began to get progressively worst and after a couple of weeks I decided to act and return the thing. I gave the technology another chance but opted for the more expensive model. I immediately noted the difference and quality - I have had the other unit for several months and still running as it was on the first day.