From what I have seen there cheap for a reason cheaper connections wire guages may be smaller no heat shrink on solder joints just cheap tape
The original harness was much better made many of the ones that cost twice as much are proubly much better made i can't say how much better made as the only aftermarket harnesses i have bought are M&h factory reproduction ones which are very well made
https://m.youtube.com/watch?v=FAf1anIjxgo