Cargo Bikes

Looks like you have already found a solution but for reference we just got one of these Ridgeback Butchers for a customer, it's about 1/3rd of the price on an electric Omnium so with that in mind here's what we've noticed just from a set up point of view:
Cons

• battery charging set up is a lot less clear than Bosch or Shimano, i.e. there's no charging bars or similar
  
• it's heavy
  
• the rails around the rack are quite flimsy
  
• there's no cap for the front rack head tube so it looks really ugly without the rack on it
  
• you can't turn the cranks whilst the bike is on its stand
  
• the lights aren't wired very well so we rerouted it
  
• the battery mount is quite flimsy
  Pros
  
• it has walk assist
  
• it has lights
  
• decent shimano components for the money
  
• built in euro lock
  
• battery is hidden
  Overall it's not a bad option for the money, especially as it costs less than a non electric Omnium but if you've ridden an Omnium, you can definitely tell the difference by a mile