I just wanted to add my experience with WordAI.
I've been using WordAI for the past month and I trialed SpinRewriter next to it to test. Having used Spin Rewriter for a year before, I would consider it the #2 for 1-click autospinning but WordAI clearly #1 and LEAGUES ahead, as in, orders of magnitude better than Spin Rewriter (both on highest settings).
The spins make very good sense on 'readable' and 'very readable' settings. I use readable as the standard setting. Just looking at the number of synonyms, you can see there is an issue with uniqueness but this will always be true, uniqueness vs quality.
Being on the cautious side, I personally wouldn't use any single WordAI article more than 15-25 times but on the other hand, the quality is sufficient to be tier 1. Another good feature about WordAI is you can plug in sentence spun articles and it handles all the word spinning like a boss. This is a good solution to making things much more unique while still retaining quality though of course sentence spinning does require manual work.
The "SUPER UNIQUE Spin" is also an amazing underrated feature with plenty of creative uses on its own.
The one prohibitive point about WordAI is its cost -- leagues above what any other spinner costs. I do wish there was a subscription level at $15/month with something like a 30K Turing word limit. As is, I am debating whether or not to keep my subscription another month... Probably not. I certainly will use WordAI more in the future but the price at $600/year is far too high to keep as a persistent tool.
Overall, I rate it at 4/5. A near-perfect autospinner with a high price tag.