I came across this conversion of a Prius, at EcoModder:
My take: while the kit is ok, it is definitely not "plug and play". There were issues with:
*prepping/charging the batteries
*missing battery bus-bars
*ill fitting brackets
*ambigious part orientation
*struggles getting the whole thing assembled/installed
They look to have succeeded, but it required a fair bit of dedicated effort and ingenuity.