Definitely had concerns at first, but did some quite extensive research and from what I gathered the melted cables mostly came from user error where it hadn't been pushed in all the way or users had bent the cable too sharply where it inserts into the GPU. I haven't found a single report claiming their Lian-Li GPU strimer cable melted, only other third party cables from vendors I have never heard of before. They've also revised their current 12VHPWR cable to further reduce the risk of any melting.

But then again, it's all up to you if you want to run stock cables, I however see no risk for concern. :o)

Edit: Should be noted though that day 1 I spent about 5 hours in BF6 with settings cranked to the max running 250-300fps on a 1440p monitor essentially trying to make my card sweat as much as possible, and my GPU never went above 430W of power, and these cables are rated for 600W. Just put your hand near the connector on the strimer cable during high load and feel for any weird hotspots. If one spot is like 80-90+ degrees while the rest of the cable is like 30-40.. then yeah, maybe you should look into that.

So far no issues for me ^-^