Gotta defend Zoom a bit here - and yes, I'm actually considering one of these to replace an HX Stomp on my pedalboard (note: I'm only using the Stomp as a delay/verb and occasional modulation FX unit, the rest kinda gets wasted).
IMO on-unit-editing is just excellent with the Zoom units. I'm still keeping an MS-50G on my board because of that. The way they managed to assign double functionality to the knobs, the way the first page of the FX blocks is laid out - you can edit things extremely quickly here (well ok, in the video of Leo Gibson, scrolling doesn't look too great, but that only seems to be true for the initial FX selection).
Then, unlike with some units of the competition, you can fill the blocks with any FX you want. That's pretty great as you can build rather complexed just-FX chains. Sure, no parallel processing as in the Stomp, still nice.
Also, as I'm comparing it to the Stomp anyway: The way Zoom laid out the first 3 (MS50) or 4 (later units such as this here) parameters that you can always access without page flipping, is excellent. And that's something Line 6 *completely* messed up with the Stomp (with almost all blocks, mission critical parameters are on page 2, such as mix for most delays and level for most drives, let alone amps), which makes onboard editing incredibly slower. This is in fact quite an important thing to me (and fwiw, I already suggested an improvement on Ideascale).
They got the encoder ballistics right, too (they're soft-clicking when dialing), whereas I absolutely disklike how this has changed in the HX-verse with 3.5 (and yes, I know I'm pretty much the only persom on earth to prefer the old way - but I need them for finetunings rather than for drastic changes, which I'm doing beforehand in HX Edit).
As far as FX quality goes, IMO Zoom is doing fine. No, their amp modeling isn't all too great, NUX is likely doing a lot better (even if I find most amps to be too compressing on my Amp Academy). But the FX are quite decent. And even within the MS-50G there's some stuff you can't find on the Stomp, such as the Ice Delay (defenitely not even remotely Strymon-ish but very useful if you mix it with a quality delay/verb following) and some filter FX types.
Finally, while I can't tell about this very unit, converter quality is pretty decent on the MS-50G, latency is super low (somewhat less than 1.5ms if I recall my measuring correctly), so even daisy chaining isn't causing troubles too quickly.
In a nutshell, in case they kept the good things from the older MS units, this could make up for a rather interesting unit in another context but just amp modeling.
Couldn't care less about the ugly design, my entire pedalboard is built around usability rather than catwalk-compatibility.