As others have written the TRNG works as advertised. Programs will generally not have to wait for random data. I managed to deplete /dev/random using dd, but once stopped the estimated entropy went up almost instantly. One nice thing not mentioned is that Waywardgeek accepts patches and ideas for the software. Remember to update once in a while.
Got it a few hours ago. I can't judge the quality of the numbers so far but I have not doubt that the quality is as advertised.
Where I was *really pleased* was how easy it was to use under Linux. Just two simple steps described in the software/Readme and it worked like a charm. I needed less than 5 minutes to get my first noise. Thumbs up!
I'm the author of a Backgammon program with one of the leading AI and I have some more stuff to convince "the dice are rigged"-complainers. Thanks!
Came packages well in a small box. Already had downloaded & compiled & installed the "infnoise" software from the web-based documentation on the machine in question.
Machine in question was an OpenVPN server running Gentoo. I plugged the TRNG in and ran the infnoise executable and immediately began receiving streams of noise. Naturally, I sampled the noise and put it through some rudimentary testing.
The TRNG puts out noise at a respectable rate and it didn't take long to acquire three 10-MB samples. I obtained one sample under normal environmental conditions, one sample with amplified heat directed at the TRNG, and one sample with amplified cooling directed at the TRNG. All three samples handily passed Dieharder, FIPS and Ent suite(s) testing facilities with no bias in any sampling. They even passed with a few scant failures (which, arguably, is what you want in TRUE randomness).
I wrote a small rc script to start infnoise on boot and direct it's output into /dev/random, rebooted and noticed a measurable responsiveness jump in my OpenVPN tunnels (particularly when first authenticating and logging in).
All in all I am very pleased with this product and plan to buy one for another server desperately in need of some good randomness, as all of its' outgoing communications are also encrypted as a rule.
I ordered this little guy while it was on back order (because everyone wants a cheap, open, verifiable source of good entropy), and although I haven't had the time to open it up or anything too crazy yet, it's a fantastic device. You'll have to go to Wayward Geek's Github to get the driver source code for it, and I would definitely suggest looking through the ReadMe file; it has an absurd amount of documentation that you should at least be somewhat familiar with (and the author clearly spent a lot of time and effort on it). It's quite easy to compile the driver (I had some trouble with it not finding a library, but it just took some time on Google, and a couple symlinks to get it working --after that it was really painless), and there's even a driver for Windows (if that's your thing), although I didn't try it out at all.
I ordered the black, EMI-shielded enclosure and it seems quite well put-together, and it looks pretty slick (if you value the appearance of your entropy generators). I never had the need to contact the developer, but given his/her amazing documentation, I would think that wouldn't be a problem.
Altogether, I would definitely recommend checking this out (at least on Github) if you're interested in using/learning about entropy and hardware entropy generators.