Thank you! I can of course only speak of personal experience but I am really happy I bought the lifetime 
that way my speed for doing WK was only dictated by how comfortable I was with learning and not with “how past I should complete in order to pay as little as possible”.
Also, I’ve seen plenty of people resetting to level 1 after completing level 60 and doing a new run to refresh their knowledge (I don’t think I want to do that myself, I prefer to use the time on reading than on reviews).
If you want to get the lifetime you should wait for the usual-end-of-the-year-sale (in a big more than 3 months), you can get a monthly-subscription until then and if there is unused time in your subscription it will be refunded, see the details on last year’s post
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