no fusing, sweet bugger all filtering and regulation, no clamping ect. if your running a mini itx board from a large 12v plug pack, its probably fine, but dealing with automotive supply? nope. can have severe brown out during cranking, so you need boost as well as buck, and there are a lot of high transients too. basically, the main 12v rail is connected to the input with only a fet in between and the switchers are for the 5v and 3v rails. see this being an issue?