Got mine today. Played around with it a bit using my home wireless ear monitor system and compared inputs.
1. The 1/8" line-in on the xy cap seems to be at normal/matching volume as the trs inputs, so not super sensitive like the zoom h4n.
2. The device itself is pretty light, as a majority of the weight is actually in the detachable mic piece. About the same size as the zoom h4n, maybe a smidge bigger.
3. xlr/trs inputs on the side, so will have to get right angle adapters to minimize size footprint while stealthing.
4. No latency issues between the inputs, which the zoom h4n had (always super annoying for the h4n).
6. Can create an individual monitor mix that is independent of the recording gain. However, you can't adjust this while recording.
7. No solo feature
8. Knobs are somewhat easy to knock, will have to tape down while taping.
9. Screen is angled down, so will have to play with positioning for stealth adjustments. Bright LCD screen.
I am going to write to Zoom and see if they can't make some tweaks for the firmware update. I think a setting where holding down the input number triggering a solo (similar to the 680) would be very useful, as would adjustable monitor mixing while recording.