MICROPHONE SPECIFIC:
So, there are a lot of little problems with this microphone/audio recorder combination, though I still think it's good enough to use for vlogging, etc. The first thing is, there were a few times during my tests where you can hear a strange sort of liquidy-sounding RF interference (like the sound of squishing something with a tiny amount of liquid in it) and while it's not noticeable when you're talking, it shows up when there's a quiet spot in the recording. I have noticed this when using other microphones with this transmitter/recorder, and I think it has something to do with the fact that it's a wireless TRANSMITTER, and it constantly looks for the RECEIVER while it's on.

The second thing that is really interesting about this device, is that when you open the file that's created with this microphone/audio recorder combination (in an audio editing application) the level starts out really, REALLY low. However, it's kind of amazing how much you can boost the level in post and not introduce a lot of self-noise (I talk more about this in the general description of this transmitter/audio recorder below).

If you can ignore this faint "squishy" RFI sound, this microphone sounds really good and natural with this recorder, yet it does with almost every recorder I've tested it with...so I just really love this mic.

Another interesting thing is that this Zoom LMF-2 (Lavalier) mic plugs in fairly securely, even though it has a locking plug that doesn't lock onto this device.

AUDIO RECORDER SPECIFIC:
As you might already know, this system is more than just a wireless audio system; each transmitter also has onboard recording. This is the feature I'm focusing on here, and so there are a number of quirks to be aware of when it comes to using this system as an audio recorder. The first is that I don't see a way to change the REC. LEVEL on the transmitter/recorder. There is a way to change the OUTPUT LEVEL on the receiver (RX) but no way to change the REC. LEVEL. What this might mean is that, if this thing isn't a 32-bit float recorder (and I'll talk about why I say IF in a second) it would seem like it's kind of limited in terms of being able to make sure the audio doesn't "clip". However, as I started testing, I realized a couple of things: 1. The record level is pretty low (so it has lots of headroom) and 2. The level indicator on the display of each transmitter says the level is higher than it really is (based on looking at the file in an audio editor). This is good, because I'm less concerned that the recording (on the transmitter) will clip, even though it doesn't seem to be adjustable. The last thing I'll say is that when I amplify the level using an audio editor such as Audacity, I'm super surprised at how clean the audio sounds...it's almost like working with a 32-bit float file on my Zoom F2 (but I haven't pushed it very far in testing yet, so I'll update this after more testing).

UPDATE: I was baffled regarding how clean the audio sounds after boosting it in post-production...and then I remembered I read that it is applying some kind of noise reduction WHILE RECORDING! I looked up the specifications, and they call it "intelligent denoise". So, while I still don't know for sure if there isn't a way to change the REC. LEVEL while recording (to the internal memory of the transmitter) I am really liking what the audio sounds like after boosting the low audio levels it seems to record at.