"Are you suggesting this is a bad gear choice?"
Not at all, I don't have enough information. Which is the point.
Some questions that would come to mind...
What happens when there is no sun? Does the phone battery lose its charge back to the circuitry? A proper diode in the circuitry will prevent this. How do we know what happens with the unit? I would want to see a test, I distrust the marketing crap the manufacturers use as specifications.
What happens if the panel output drops down to say 30% of rated output due to time of day, angle of panel, or weather? An iPhone will shut down the circuit if the voltage/amps is too low. A larger wattage panel could solve this with a proper controller to continually provide the correct power to the device.
What happens if the voltage goes too high for the device? A charge controller will regulate this. Does this unit have a charge controller built in? I suspect that if I orient the panel directly at the sun, at noon, in July, in Palm Springs the unit will put out too much power and my iPhone would shut down the charge circuit. I bring up the iPhone because it is popular and the battery is not user replaceable. Apple designed the charge circuit so these variables will not shorten the life of the battery.
If someone *needs* their phone or other device and it rains for 5 days, what is the plan?
I bring all of this up because these solar solutions are not inexpensive. Also, for me, a solar system for backpacking is not viable for how I hike. That said, if I where to do a multi-month trip I would need some sort of communication/charge solution to stay in contact with my wife, or she may not let me go. I would choose something like the GoalZero system with the battery pack. I am not saying it is the best, but it solves a lot of problems, especially reserve capacity. I have tested it and it does what the manufacture says it does, verified with testing. I own one because it was a gift. My wife and I have spent weeks in our camper self-sustained in bad weather without a dead battery bank. We do this because we know how much we consume each day, how much we can put back into the battery bank, and how long we can operate without sun. All of this is part of the formula.