I have received a trial version. It is much improved compared tothe previous version. Now you can select topics as suggested or use "Edit filter" to filter the topics you want.
I think the developer continues to make KK better which is a plus point when you are paying yearly fees to use the software. Probably KK will stay longer with regular updates. A lot of IM software have come and go over the years. Yearly fees make more sense for the longevity of the software.
I don't use copyscape as I usually touch up the article. This takes about 15-20 mins for 600 words. KK is a good idea generator. With 100s of snippets (it can run into thousands of snippets as it depends on the number of content that is available at Google), you can use which one you want to use in the article. You can expand the snippet further. As I said, each snippet provides me an idea to write a point. That is good enough for a paragraph. This way, it speeds up my writing especially if I need a quick article without manual research on Google.
KK can be improved further with users' input. For example, an option to add "keyword is", "keyword can" or "keyword + LSI" into the search etc to collect more relevant snippets. I am not sure if this is possible.