I have done some preliminary testing, I'm not sure I'll get to trying the Saramonic out in the field any time soon. I can find no good review of the device though it has been around for almost three years now and not much noticed as far as I can see. It was introduced almost two years after the DPA MMA-A at about half the price, aimed mostly at voice podcasters I think. It still retails at $349 at most places but is being dumped at Focus Camera for $99, it will be interesting to see if it just disappears or has a follow-on model. TS isn't the only place that didn't hear about it.
I accidentally left my Metarecorder set at 96 kHz CAF files, it recorded CAF but only 48 kHz, with the correct 48 kHz sized files. It seemed to use much less battery than the MMA-A at 96 kHz, whether because of the lower sampling rate or also other power uses, anyway it looks like I might get double the almost 11 hours I get with the MMA-A at 96 kHz on an iPhone XR. Although the Saramonic Lightning cable works fine in the MMA-A, the DPA Lightning cable is a bit too fat-ended to fit in the Saramonic.
The MMA-A is limited to max 30 dB gain, which is fine for say DPA 4060s but low for 4081s or 4061s. The Saramonic is also limited to 30 dB, which was fine for a set of omnis from Soundman, but a bit low for some AudioTechnica cardioids I tried. There is no app like the DPA app, you set levels with buttons on the device. It was easy to move both channels together, but I had some difficulty with the channel balancing (long and short pushes, then long push to save). It looks like the mic voltage is about 2.5 V on my crummy multimeter. Works with iOs and Android (I'm looking for a good simple idiot-proof Android recorder app), also with USB-A cable to computer.
I just recorded room background, files look okay (no weird anomalies a la Tascam X8) . I'll try to get a better read, but my impression is that it a viable device, at $349 vs the MMA-A I wouldn't touch it but at $99 a bargain.
Jeff