But I also second this. Don't just rely on one usb. Back them up on 2 usbs and maybe other ways. On some wallets you can recover your coins from a seed so write that down as well.
Eh, I like brand loyalty as much as the next guy, but hardware is hardware. You might not have issues with Sandisk, but I have numerous times. Just like I have with most other companies. As such, when it comes to something like this, just being careful is the best step, rather than relying on the hardware to serve its purpose for a lifetime.