Best and most complete importer for SMF2 forum?

Yes, @dsanchez, I did and it worked beautifully. Only one to consider (at least in my experience) that I pointed out here: https://meta.discourse.org/t/importer-for-simple-machines-2-forums/17656/81?u=agustincordes

In my case, I was also taking the opportunity to change the whole URL of the forum, which is why I suggested to rebake all posts. However, that may not be necessary in your case.

Good luck!