Odd name aside, I finally got a chance to play with mine this evening and I'm pretty happy with it.
I just did a few simple tests and compared its readings to my Rigol DM3058 and my electronic load.
Cliffnotes - it doesn't do single digit or below mV or mA well. Above about 10mV or 10mA and the error comes down quickly.
Measurements are below:
Fixed voltage source, no current
Rigol Mooshimeter
0.253mV 0.4mV (only does .1mV precision)
Rigol Mooshimeter
3.0127V 3.0133V
Current feeding a little logger device I have
Rigol Mooshimeter
1.61892mA 2.4mA (only does .1mA precision)
Current using CC on my bench supply (supply set to 211mA)
Rigol Mooshimeter
210.721mA 211.4mA
Simultaneous voltage and current measurements using the bench supply and an electronic load (I used low current to try to keep the voltage drop in the leads as small as possible)
Load Rigol Mooshimeter
16.722V 16.7216V 16.7203V
49.0mA 49.653mA 50.4mA
Measuring a 1k resistor
Rigol Mooshimeter
1002.05R 1000.72R
You can sample and log at up to 8kHz, 1-64 point smoothing, and just turn the phone sideways to graph it. Syncing the device with the phone was incredibly easy. The only thing I didn't like in the UI was how you change modes between current, resistance, etc. Other than that, the interface is very KISS and easy to use, and the device itself feels very solidly built, decent quality leads, nice case, extra fuse, etc.
I like the separation between the device and the display that it gives you. No more tweaking your neck trying to see the LCD on the DMM attached to the circuit on one side of the bench while you adjust something on the other side of the bench. Just put the display where you need it, and leave the DMM next to whatever it's measuring.
For quick and dirty measurements I'll probably still go for my Fluke, nothing beats picking up the device, twisting the knob to the right mode, poking the DUT, and getting an instant reading, versus doing all of the same PLUS pulling out your phone, unlocking it, finding the app, etc. That said, I can certainly envision many scenarios in which I would prefer the Mooshimeter over either the handheld Fluke or the bench Rigol, so it's going to stay in the lab.
I didn't get a chance to test the logging capability yet, hopefully soon.