I use it and like it. It is quick and easy.
They do have some tweaking to do to their tests, but they are working on it.
When they fine tune the test, you get it because the peramiters and in the app not the tester.
I just got mine in the mail today. After comparing test results against Hanna, Salifert and Red Sea I'd say it's a flop. Already looking to return it :/