Well, I am very pleased with the Best Spinner, quite an ugly piece of software, but extremely useful. What I like the most is its huge synonyms database, it is really large, the largest so far, actually. However, I don't use it for spinning, but rather for paraphrasing, and it is really good for that. If you also subscribe to Grammarly, chances are you won't need anything else.
I don't think is realistic to expect from a piece of software to transform a text into something decent/readable for a human reader....