Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor results and no response from tech support

I am very disappointed in the Brunton Solarport 4.4. I wanted to charge my iPhone but was unable to charge it; even in full sunlight with the phone turned off. It did charge my Garmin Forerunner (a smaller device.) Not much bang for the buck; I wouldn't recommend it. No response from product support guy; won't return calls.