I've started over from scratch 3 times and this is just not reliable enough. The 3rd time I added a product, continued to setup the rest of the settings only to find my product had disappeared and I could not re-add it.
If you use an alternate WordPress theme, you will find critical Widgets are missing.
Want to edit shipping services? Nope. All 3 times I was not able to edit because clicking on the edit link does nothing. I used Safari and Firefox with the same result.