Extension works as expected, I had few issues at the beginning some I migrated from M1 to M2, and it took some time for me get used to a NEW tool that can do both Export and import. basically it works as expected. Make sure if you are coming M1 that some balls or main system attributes now changed in M2, so this is where I was little confused and it was not working for me (M1 Attribute Yes/No: Values used 1/0; Now in M2 You need define actual Words like: Yes/No) those sort of small things, thats why I didn't had luck importing about 50,000 products ... then after contacting support team, they got back to me, and tested my files and found the error I had, and after their input it was solved. Overall, I really like the extension but the I think the timing could be improved. Before in M1 my 50,000 Products took to import about 10-15 minutes (we used tool called: FastImport), now with this tool it takes bout 45 minutes to import 50,000 products with about 20 attributes for each SKU. Hope it helps!