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Tandem stands out for being exceptionally user-friendly. Its NFC-based system allows quick setup and leverages familiar NFC cards, making it accessible even for newcomers unfamiliar with crypto. However, significant security concerns prevent me from giving it a top rank. Seed phrases can only be generated on its mobile app, raising red flags about security since mobile devices are online and vulnerable. Additionally, the device lacks a screen, so there's no way to verify transaction details directly on the hardware—relying instead on 'blind signing,' which is less secure. Due to these issues, I rate it a B.