Hi,
I can only report my experience, as I have never purchased anything else from that store.
The package I received was not in immaculate shape: the box is white and it was quite dirty, and I assume it was due to years of waiting on some shelves in the warehouse.
Inside the box, everything looked neat and clean: no scratches, no fingerprints: it really looked like a brand new product (as it should have been since I bought a new product).
I like the 4 foot switches: they are smaller than the ones I have in my Dwarf, offer less resistance, and seem reasonably solid. The metal casing looks fine to me, and all the screws are in place.
Now let’s talk about operation: the device offers two two-line displays, each of which has 15 characters (it should be 16, but -according to other discussions in this forum- it seems that the last one disappeared after the lastest firmware update). You can assign a parameter to a footswitch or assign all the snapshots and cycle them. I don’t think it is possible to cycle the pedalboards.
I can’t speak for Mod Duo X, but comparing it to the Dwarf, the latter has better labels: when assigning the “Button” control of the “Multi Button to CV” plugin, the Dwarf shows 3 signs to let the user know the state of the button (Single press, Double press, Long press): the Mod Footswitch only shows the name of the control. On the other hand, I find it much easier to press the Mod Footswitch to activate a double press than to press one of the Dwarf’s switches.
Other plugins that make better use of labels are the Looperlative loopers: if you associate the Loop control with the Dwarf the label changes depending on the action you are about to perform (Record, Overdub, Play) and the LED flashes accordingly: the Mod Footswitch only shows the name of the control and the LED has a simpler behavior.
Another thing to consider is that Mod Footswhich is a device that is not exactly cheap and it’s bounded with Mod devices: nowadays there are plenty of midi controllers that offer similar features, better screens and -being midi controllers- can be used to operate on other devices.
Personally I didn’t regret my purchase and I am very happy with the device.