Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worked well...for a while

Well, seems like this is a common problem with this device. Mine worked flawlessly for about 6 months of almost daily use, and then one day I plugged it in, it lit up blue as it always does, and then turned off...forever. The case smells like burned electronics, so I'm guessing some component inside just gave out. They need to use some higher-quality electronic components in this thing! I know it's relatively inexpensive, but I expected more than a few months of use out of it! In effect, my $20 basically went towards "renting" this unit for a few months. Quite disappointed.