Product review (4 stars): Solid, but unpolished.
We bought three of these for tracking temperature changes in shipments. We haven't tested them against calibration sources, but all three seem to perform consistently with each other so they work well enough for our purposes (we don't need extreme precision). The devices themselves are very easy to use. The software, though is a bit unpolished, and the misuse of the English language is awkward and confusing. As mentioned by another reviewer, they would do well to hire somebody to clean this up. The bottom line, though, is that they do what we want well enough and day-to-day operations are very easy to explain to others.