Magmi is great for M1.
Concerning M2 as it is doubtful.
I tried to import through the adapted version for M2 ( Для просмотра ссылки Войди или Зарегистрируйся
1. The problem occurred immediately: a folder with imported images was created separately (as in M1: / media / catalog / product). Accordingly, the images themselves in M2 were not imported.
2. Next, the problem with swatch attributes. And how do you make them in CSV? For example swatch with color codes? In M1 this is not.
3. When importing attributes via Atrribute set importer, after importing the third file (there are three of them), the error constantly flied:
Attribute Set Importer v0.0.2 - Exception in update / insert loop for entity 'attribute association' in record no 8: SQLSTATE : Integrity constraint violation: 1062 Duplicate entry '4-94' for key 'EAV_ENTITY_ATTRIBUTE_ATTRIBUTE_SET_ID_ATTRIBUTE_ID', see trace log !!
Accordingly, two questions:
1. What Magmi did you use?
2. Are there examples of working files (for importing attributes, including swatch)