Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Entirely unreliable

This device worked fine for a few weeks, but then it started to dispense smaller than requested meals, and sometimes skipped them all-together. Reprograming it did not help. Changing the batteries did not help (and wasn't that fun, since it automatically means you have to reprogram it!). It looks like they've come out with a newer model, but I think I'll try a different brand.