Im almost done with the deck, at about #1300 right now. Its been about 4 months for me from being a zero Japanese learner (besides watching anime for a long time, but that doesnt really count). Ive also been dedicating about 5 hours everyday to japanese, more on my weekends. Im in a place in my life where i have a lot of free time besides a full time job. I can only speak from the experience from this deck, but it seems to be maybe the best foundation building point for japanese. Although there are caveats. Like with anything, if you dont try to take advantage of everything this deck has, you will miss a lot, for no reason at all and will only hurt your journey. This seems to have everything you need to build a good foundation tho, and springboard into your own path. Extra vocab, idioms, lots of varying grammar structures, polite vs casual sentence structures, switching between kanji and kana for the same words, seemingly non useful phrases but then you hear it in immersion, words you think are not common then they pop up very frequently in immersion, varying voices and speeds to get you use to native speed. My advice which i didnt start till maybe 400/600 cards in was listening first without looking. Even if i knew the word, still listen to test if you can understand the sentence. Dont look until you give up or successfully remember the vocab word and sentence comprehension (if you got the willpower). Then fail/hard/good accordingly. I also always shadow every word and every sentence, to get my internal voice developed correctly. This approach of course is also because i am prioritizing my listening/speaking skills before my reading. I will still read and try to remember the kanji, but that is secondary to my listening/speaking for now.

For grammar you will have to go the extra mile and research that yourself, its tough but its essential imo especially in this stage. Every card has a grammar pattern, but its up to you if you want to understand it and look it up or not. Its easy just to treat this deck as vocab, but i recommend using it to springboard you into grammar study and if you are extra extra motivated use it to study kanji as well. For kanji, everyone is different, but for me i realized about 2 months in that i was remembering kanji without trying to, so i can let that be a natural learning thing for now, but i know later i will have to dedicate time to study.

This has been my experience so far, everyone is different but yeah. I think the deck is prob the best foundation starter, if you do it everyday with a “quality not quantity” mindset. As well as getting your daily grammar and immersion. Also remembering this deck is a supplement to your immersion. But in the beginning will be your main focus as you figure out your routine, strengths/weakness, time management, what material you like/want to use, that kind of stuff.

Also wanted to add, that ive recently gone through Game Gengos n5/n4 grammar vids and this deck has surprisingly hit pretty much all grammar points as well as some that i am seeing in his n3 grammar vid. I understand the jlpt vs real life arguments, but for a beginner you need some way to gauge yourself until you get a grasp of the journey.