Robert is right - this is not an utra precise mesurement tool. I spend a few hours calibrating it and it is far to be perfect. The GUI takes some time to understand too (and is sometimes a pain). I would say the vertical precision is right now of about 10 to 20%. The screen resolution is not very high, but it is so damn small ! The effective bandwith is about 15Mhz (144 MS/s) on a single analog channel, half if using 2 analog channels (72MS/s / channel).
However, if you are tight in space, and want a small pocket tool to see what is happeping, this is “ok”. This is a good tool for the price (That is also all the money I could spend right now). If you want a lifetime tool for more than “viewing” what is happening and measuring peaks accuratly, you may look for another device…
What is great is that it is an open-source device : you can modify its software, and I think in few months we will see alternative software for it (people are working on a quick spectrum analyser function using FFT, and I2C and serial analyser, etc).
This is a memory scope : You can capture a PWM pin for 1s, the signal moving very fast, and then stop the capture and scroll back slowly to see what happened. This is not something you can do with a traditional analog scope.
So : as most products, there are pros and cons (especialy for low cost products).
I have to say that at work I have an old but good 2x 100Mhz traditional analog scope (35 pounds…) that I can use if I need !