I bought the components off Amazon before the "kit" was available, which meant having to order five or so items instead of one. Still, you have to spend the 10 minutes (if that) to put it together - far easier than some of the Frankenstein computer systems I've cobbled together in the past
I also bought a cigarette-lighter USB adaptor as we conveniently have an outlet in the 172 that this one is going into... don't have to worry about power, and the USB adaptor has three ports so the iPad can also get plugged in.