Does this product actually work in Win 10 64 bit?

I can say that it does but I have always done a fresh install of W10, not an upgrade. Always 64-bit.

I also take the precaution of uninstalling the Sandisk software, restarting, formatting the SSD then erasing the filesystem in Disk Management, turn off, disconnect the drive, perform the OS install, then (when complete) reintroduce the drive and install the 1.3.2 software.

It may also depend on other hardware in the system. I have carried this out on low-end Intel platform (B75, H61, H81 etc.) There is one more G41 based system that I will be upgrading.