yes they're good. tons of people have bought some and I've never had a single negative comment about them. They have a bigger outer diameter than tilt pegs, which means they have more sliding surface and come more flush with the deck. They also have a thicker wall and are heat treated, which means they're hella strong. Only thing that can happen is that after many months of hard riding, the ends can dent a bit. It's nothing serious, but that will happen to any aluminum part than gets as much stress as pegs.
QCS has been around for over 2 years. Tilt has just come up. So QCS have a much longer history of quality parts.
Get them. I promise you you won't be disapointed. And if ever you find a problem, you can always email me and I'll help you out with it. I'll even replace them if I judge it necessary.
I'm telling you: QCS is legit. Don't jump onto new parts only because theyre shiny. Get them because they are proven to last.
You can use your stock razor axels or get the QCS pegs bolts for more strength.