Really should think this over in my Humble opinion
I purcahsed one of those kits for my RV 7 and the big advantage is the wire selection (i.e. gauge of wire)has been chosen for you. The bundle makes many assumptions though,as it must do, in order that you get what you need.
Assumptions are:
power draw - do you use led or conv. lighting, are you using landing lights etc.
THE BIG one is are you putting switches up as per the VANS drawing?
In my case the power draw matched but the bundling of wires was totally wrong for the panel i am putting together.
Outside of the time to put on the connectors the purchase of the kit was a waste for me, as i disassemble most of the bundles and found the ones left would take only a few minutes to do.
If i built another, and i wont! I would decide on all my electrical components, then my panel and build my own. It really isnt that hard when you get to it going one wire at a time and having read a few books on amperage draw and wire gauge size.
Good luck
Dave