I, personally, am not so inclined. I tried to put it together myself and failed. Good thing I have an awesome local bike shop and Bike Friday dealer, John Boyer at Edible Pedal, who could help out.
The OSATA (One Size Adjusts To All) feature is awesome! The frame can be squeezed down to someone 4' tall and extended to fit those over 6'. This could be your child's first cargo bike!
Compared to other cargo bikes
Compared to the Yuba Mundo and other longtails, the HaulaDay is about half the weight. The 20" wheels are quick to get rolling and self-balancing, which is a big bonus in city traffic with lots of starts and stops. The deck on the HaulaDay is lower which brings down your center of gravity making a more stable load for a longtail design cargo bike (same reasoning behind Xtracycle's Edgerunner). The 20" wheels can make the bike a bit more squirrely to ride than the tank-like Mundo, however, with the addition of our front basket, I find the HaD to be more stable now. We did, in fact, sell the Mundo because the HaulaDay was able to work better for us.
Long John/bakfiets-style bikes like the Bullitt or Workscycle have a learning curve associated with the linkage steering. Some people are fine with it, some are not. When I loan out a cargo bike, it's always going to be the HaD, unless they already have bakfiets experience. Anyone can ride the HaD without much adjustment. Again, the HaD is much lighter and has a much shorter wheelbase, making it easier to maneuver and find parking.
HaDs are custom built so you can choose which components best suit your riding needs.
By public transportation
We haven't tried taking the bike by bus, yet, but it's doable. I really like that I can pick up this bike on my own, not an easy feat with the Mundo or the Bullitt. If you squish the OSATA option down to one of the first two buttons and turn the front wheel 180 degrees, you have a standard bike wheelbase. Great!
There are also a couple of accessories that I'd love to see in production sooner, especially the Piccolo mount. A few of the accessories have only just gotten to us recently. Custom bikes take time and Bike Friday is a little shop trying to do it all. It can be difficult to be patient. I still heartily recommend the HaulaDay and Bike Friday but be forewarned that you won't get instant gratification after you place your order. Still, it's worth the wait!
There is so much exciting news going on at Bike Friday in regards to the HaulaDay, it's hard to keep up with it all. I know they have great plans to get as many of these bikes out on the roads to help others out of their cars.