First, I was a long time power user of Anki and don't mean to disparage it, but I think CleverDeck has a much better user experience and design.
Second, we've spent a tremendous amount of time putting together high quality frequency lists (mostly for languages right now) that incorporate professional imagery, native-speaker audio, transliterations (where relevant), and example sentences. Usually, making or piecing together your own decks and cards is the most time-consuming part of using an SRS - and user content is often of dubious quality.
In terms of the spaced repetition, though, CleverDeck and Anki actually use the same algorithm.
I've recently started using Anki, but have only found it useful for taking a mental model that I sat down one weekend and learned, and re-enforcing it. How valuable are these frequency lists for learning something entirely new? If I wanted to use them to say, memorise the api exposed by ActiveRecord, would they be useful, or would they ask me a series of questions that I couldn't yet really put in context?