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.
Well...I bought this because I did use dice. Dice worked, but I am sort of impatient. Rolling 99 die seemed tedious, and for $50.00 I thought this would be cost effective. I imagine that hardware wallets, good ones, will have this type of hardware RNG built in, in the future. My only wish was that there was some way Armory could query this device directly as a source of entropy.
Or less chaotic, just put all the cards on the floor or table and swirl them around for 60 seconds then put them back together. The ordering of a deck of cards has 225 bits of entropy which is technically overkill anyway: 128 bits is generally accepted as forever-secure. You'd have to be trying hard to "cheat" to end up with less.
) Sometimes when I shuffle a deck, the cards are too similar to the original.