This charger is very durable and is made from high quality monocrystalline cells, meaning the cells are more efficient and perform better in extreme temperatures. I really like the design of this charger. It is stiff enough to maintain its shape when pitched or leaned and flexible enough to hang over curved tents, cars, etc. The charge controller seems very smart when turning off and on when there is enough light, and I also appreciate the LED that shows when the battery is charging. The charger is lightweight and folds down to a convenient size for storage in a backpack or briefcase. I used the charger to charge my backup battery or charge my phone directly. The sun is the biggest challenge with solar chargers - you often have to be creative to place the panels to get the most light, and this charger has eyelets on the corners for attachment with carabiners, cords, etc., so I can always find it can be a good position to maximize the load. I used the charger during a motorcycle camping trip and was able to use the charger in the tent or on the bike and strap it over my tail bag to charge while riding. I also appreciate that there is no battery - I prefer storing the battery separately as I can then choose which battery I want to take with me or just charge my devices directly. Additionally, these panels should last much longer than the battery cells.