I haven't tested it with an OEM charger but I think the speed may change depending on the wattage of your power supply. Charging doesn't feel particularly slow and the USB port on the side works. The case on my device looks cheap, the USB port is difficult to use because the tolerances are too tight. I bought a USB-a to USB-c adapter and haven't thought about it since. We also recommend purchasing a right angle USB cable, otherwise the underside of the cable head may rest on the table.
USB C to HDMI Multiport Adapter with 100W PD Charging, Thunderbolt 3 to HDMI Hub 4K π» Video Output Compatible with MacBook Pro/Air 2020/2018 iPad Pro/Air 2020, Galaxy S20/10 - QCEs USB-C to USB 3.0 Adapter
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π High-Speed 6.5 Ft UL Listed AC Adapter for Quick Charge of Hd Hdx 6" 7" 8.9" 9.7" Tablet and Phone Tab Power Supply Cord, Compact Portable Travel Charger
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π‘ KINGDO Surface Pro Charger 36W - Compatible with Surface Pro 3, 4, & 5 - Including Carrying Pouch
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