Youāve seen everything there is to get a feel for what you think of it, really. Itās 57 more levels of that. All that you havenāt gotten to experience is how itāll stick with you longer term, but if you keep spending time with Japanese regularly, thatās nothing to worry about.
Since youāre getting mostly positive answers, Iāll just give the counterbalance as I see it. Absolutely, objectively, people have learned and remembered kanji through WK, itās all about if you like how it works (rigid structure and all) and can spare as much as it costs. WK works.
Just, what also works is⦠pretty much anything else sensible. People have mentioned sites like Renshuu, or you could use an anki deck with kanji, or you could study words directly through any means without really specifically ālearning kanjiā and they come along with the words. What youāre getting from WK is the following:
Their spaced repetition system - Some people like how itās all done for you out of the box, but itās also very rigid. I preferred and generally recommend add ons to mark typos/synonyms correct manually, or even not type at all, etc, which is doable but you need to essentially mod the program to force it. The algorithm itself with its set time intervals is pretty much objectively inferior to what you could get somewhere like Anki thatād adjust to you, but Anki requires a little more setup. To be clear there are still some SRS principles being used broadly in the increasing intervals, but the room for improvement is immense over the one size fits all type specific time intervals.
The breakdowns and mnemonics - This was why I used WK when I did. Mnemonics are hit or miss and I think trend worse over time, but you can see how you feel about them. Having someone nicely break it into parts and hold your hand can take some pressure off and help you learn how to learn kanji. There are a few other places online thatāll give you their own spin on these sorts of radical breakdowns, though.
The interface - I mean, makes no difference to me personally, but Iāve seen people complain that anki is plain and minimalist without effort to change that so you might care.
Over time Iāve gotten kind of disillusioned with WK and decisions made that has soured me somewhat, but itās also true that I used and was helped by it. In a vacuum if someone asked me Iād probably lightly recommend against it in light of all the other options that exist. If someone told me they were using it, though, I wouldnāt discourage it, Iād just go āOh nice that really helped me,ā because it did. Ultimately if you stick with Japanese youāll be fine either way, so try to work out how youāre feeling about what the site is doing.