Don't buy: 1. UHS-II. UHS-II's boosted speed was thanks to a second group of pins not found in most card slots. Further, their outrageous price and low capacity is also not suited for the switch. And I would suggest waiting for SDXC before buying any card. 2. Third-Party Charging cable. QC 3.0 (18w) is nothing compared to Nintendo's 39w charger. We still don't know the switch's power rating as a handheld. 3. Power banks intended for generic phones. The switch might consume more power than they can provide. As with the second one, wait. 4. Wired controller via. It takes up the charging port, enough said. 5. Shell/ Battery Shell: Interference with cooling can melt your console. Don't have to buy: 6. Controller grip for joy-cons. They are great but not designed to travel with or stay on the switch at all times. Another great substitution is the joy-con wheels that come with larger shoulder buttons. Besides, joy cons are small anyway. 7. Charging Grip. Unless it comes with a standalone battery, using joy-cons separately is suggested. Should it come with extra juice that can power the joy-cons times over, however, it be a must have. Suggested: 8. Pro Controller. However, Nintendo might add support for wii/ wii u pro controller, gc adapter and even DS4 and Xbox One controller in the future. 9. Screen protector. Especially for touch screens. 10. Carrying case. I am lucky enough to grab the special edition on Amazon. I might even sell the full package after launch.