what are you guys going on about?
1. m390 can stain. depending on the heat treatment. it's been seen that even benchmades 20cv which is the same composition has shown rust. do you want a link?
https://www.bladeforums.com/threads/20cv-rust-pits.1545752/
in any case it's will differ based on heat treatment, the blade finish, environment and maybe other factors. because one brand doesn't rust for you doesn't mean another won't. and don't forget these are mass production knives. they may differ knife to knife or batch to batch.
2. this is just one knife and Peter explained this and thoroughly tested it to be sure he wasn't doing anything wrong on his side. as he replied steelwill just received the knife and will probably be looking into it soon assuming they have the time to do so. its not like other brands don't have occasionally have blades that come off the line bad.
3. steelwill have responded well to the situation and that speaks volumes about the company and their warranty.
4. Peter has responded that he is getting another 3rd party modus to test and will be doing a series of tests on it when received, I'm guessing he'll do the same when steelwill return him a knife.
5. test your shit. use support and warranty if needed.
6. don't over react to the video and make assumptions. peter certainty isn't putting this as a fact. he said it was one knife and these are his findings.
7. ignore Gaston at all costs. he doesnt know what he's talking about.