I am just beginning to solder, and I am committed to using non-leaded solder. After some research, I have settled on SN100C, but I haven't used it yet.
No idea, but I'll give you an upvote for joining in!
The tin solder you mentioned is 99% tin and has a very high melting point, so you'll have to be careful with hand soldering not to cause heat damage. You can also expect rework to be difficult, with lots of burned flux.
The photos at your link show some gorgeous joints, so good luck! It may be that the trace amounts of Ge in the solder will help with joint longevity.
Since I don't do production soldering, and cost isn't really a consideration for me, I use 3% silver alloy to keep the temperatures down, when I'm not using 63/37.
I guess so. But there's nothing I can do about that right now sans going to the future, as I'm still acquiring the pieces. Haha. I was trying to just make it clear that this was a choice was due to research and not use, as of yet.
https://aimsolder.com/products/solder-alloys/sn100c