I don't know much about that device or company behind it, but I will say that a true HWRNG is overkill if you are creating a couple wallets and don't mind doing dice or cards yourself. Why? Because you need like 100 bytes of entropy
per year to create a few wallets. Most HWRNGs produce X kB
per sec (the quantum RNGs produce 10 MB/s). I'm sure this device is good, but the random numbers Armory uses for the online computer are not only cryptographically secure, we throw in a bunch of other entropy from mouse clicks, system files, etc, to ensure even better entropy.
If grandma was going to use Armory, we'd say just use the built-in RNG -- we use it and we trust it. If you're going to do some custom thing, use dice or cards. If you need to create millions of independent private keys, the HWRNG is probably the best choice.