Not sure about version 1, but I'm testing version 2 right now and I have to say it's the best auto spinner I've seen bar none. The content is actually extremely readable and probably better than the manual spins a lot of people do out there. However, some of the content doesn't pass copyscape so make sure you play around with the settings. Minor edits should do the trick. I'm on the trial now but seriously thinking of keeping the Turing plan for my Tier 1 content.
SpinnerChief API is the function that allows other developers to use SpinnerChief functions in their softwares and users can use SpinnerChief functions in other softwares directly. As users, you need to register a SC web account to use the api in other software. As developers, you need to register at http://developer.spinnerchief.com to get an apikey to use in your software. The developers who have already integrated the SpinnerChief API are.
From personal experience Spin Rewriter is the best! like I still use it today. Its so easy to use (Just copy paste and the program do everything) Because of this tool I managed to schedule content and articles for 3 years, do you know how much time and money I’ve saved?!?! A LOT!!! Also i high recommend you pick their mothly plan if you are still in doubt