My two cents as someone with lots of miles carrying kids and other stuff on a non-electric cargo bike:
I think you should be more focused on whether this particular bike fits you and is capable of carrying your two kids and whatever else you want to haul. From a quick glance at the specs, it looks like it only comes in one frame size. That may work for you, or it may not. The best deal isn't a deal if the bike doesn't fit and is uncomfortable.
Also, what is the total weight capacity of the bike, and the weight capacity of the cargo deck? Most of the bigger manufacturers publish those numbers, and they may not be as high as you think. As an example, IIRC, the Xtracycle flight deck is designed to carry up to 125 lbs. total.
How will you safely carry your kids on the deck? Do you need a child seat(s), stoker bar, or other rail system, and is this model available with or otherwise compatible with these kinds of accessories?
Is this model compatible with other cargo accessories from other manufacturers that you may want to use, or are you limited to whatever this company produces?
Do you need fat tires for the types of surfaces and conditions you'll be riding? While they may offer a measure of additional stability, fat tire sidewalls are usually thinner and replacement cost higher than regular touring tires. Also add a bunch more rotating weight if you want to actually pedal the thing.
Edit to add: Yes, a wide kickstand is a must IMO. I use a Rolling Jackass that lets my kids get on by themselves with no problem. Also great for loading up any decent-sized load. Yes, it's expensive, but not in the context of dropping $2K on the bike.