Thanks for the correction. But still, original 900M series tips are hard to find nowadays (lots of em have a so-called hakko packaging, but no actual hakko markings on the tip itself, so it can be misleading sometimes) so the T18 ones are preferable IMO.
But there's pro's and con's to this of course (as the 900M ones are cheaper, and not all replicas are that bad)
I never said the T18 should be avoided; they're excellent tips. And I'd take them over the 900M series as well. But they don't yet cover all of the shapes in the 900M series, such as drag soldering tips.
As per locating them, Hakko will sell directly if you can't find a distributor (or one with stock).
As I previously mentioned, I was speaking from experience.
I've used it myself many times (and ordered from the exact same place) so I can definitely vouch for it.
It's exactly as on the picture, and does act like a 63/37 solder would, plus flows extremely well.
And I'm not sure how you've made it to the conclusion that it's not 63/37 just by "the looks of it"
Great. You've been lucky.
Generally speaking however, the supplies coming out of China are terrible performers. Now consider it's very easy for a beginner to simplify your statement as
Chinese solder & supplies are good, even though that's not specifically what you wrote.
And even though you've gotten some consistency with the particular products you linked, the source may fold, cut corners, or be dismissed by DX for a lower cost replacement at any time. With the buyer likely being unaware of any changes at the time of purchase.
So although it may be better than most of the stuff flogged on eBay, DX, ... , it's still a gamble vs. buying something from a reputable manufacturer.
As per the looking at it comment, the appearance becomes duller as you add more lead to the mix. Ever worked with 50/50 tin-lead for plumbing? That's not as shiny as either 63/37 or 60/40. Worse yet, would be car battery posts. I've also a materials background as well as electronics that resulted in experience testing this sort of stuff (testing incoming components, supplies, ... prior to clearing it for production).
...trying to
discredit my recommendations based on speculations (just to make your own look better) is something else.
You're making assumptions here. See above.