I've been studying Japanese mostly by following advice from this forum and adapting it to my situation, and while I remember clearly a couple of times where I was kinda lost for what to do next, threads like
Nukemarine's Suggested Guide for Beginners and
Users study methods helped tremendously in developing what has become my study method (which is nothing fancy, but seems to work perfectly for my needs).
FWIW, this "personal method" got me a pass (though not by much) on last December N1, without really studying for it (some practice tests with the old format and a quick go at a vocab list to see if I was missing much).
I started with rtk when I registered here, so that's about 18-19 months if I'm doing the math right. Mind you I didn't start exactly from 0 as I have a failed attempt on my back, about 2 months messing with a course textbook which didn't really get me far (hiragana/katakana, a handful of kanji and basic grammar) but at least I more or less had an idea of what to expect. I think that's a common start point for many silverspooners/ajatters too, seeing as it seems to target people that are "tired" of conventional methods (which probably means they have tried them).
I'm happy with my progress even though I wouldn't call me fluent by any definition, but more than anything I'm happy with my new self: the most rewarding aspect of the whole experience was realizing that I'm able to stick to a long-term project drawing my own path, which changed my views on many non-Japanese related things.
Of the whole AJATT thing, more than the methods I really liked the "find what work for yourself and JFDI" approach. In that respect I didn't really "understand" Silverspoon when I first read of it.
But.
Now that I've been studying Korean too for a couple of months and the initial enthusiasm has faded, I'm starting to remember how much of a bitch the beginner phase can be. I think that's easily forgotten.
Not being able to understand stuff in the language you are studying means being in the dark regarding the actual effectiveness of whatever method we are using.
It takes a big leap of faith to just accept this and keep going, and if I hadn't had my experience with Japanese behind me I would have probably quit at least 3 times already.
Even if I have the resources, I don't really know what to do with them, how to use them, if I can "trust" them.
Part of the problem is that I have yet to find a serious and dedicated community like this one, but even if I had found one it's not always easy for a beginner to distinguish good from bad advice, and it can't be asked of a community to give advice according to the needs of every student, not to mention that in such a phase the student isn't probably even fully aware of what he wants.
So I keep going, messing around fully knowing that at some point something is bound to work and give me some results, but even then occasionally I find myself thinking that something like silverspoon could help me a lot.
It's not really about the time saved by not having to look for resources, but the fact that it is much easier to just let go of worries and do stuff if someone is telling you "hey, this works, try it", EVEN if it turns out that it won't work as well as you were expecting/promised, at least you are doing something and putting in the time. Which is probably all that matters.
That being said, in it's current incarnation silverspoon doesn't really appeal to me (even a hypothetical Korean version). I'm ok with some hand holding, but from my point of view it could actually be detrimental in the long run. I know I benefited a lot from trying things for myself and would hate to miss on that.
I would actually really like (and probably recommend to friends) a more intense, condensed version aimed at getting people out of the beginner phase fast, where they can start appreciating native media with some decent understanding. From there self-cruising shouldn't be a problem, I think.
Of course there's the matter with the price and the refund policy, which has been discussed in great detail already.
The claims about the promised fluency also pose some doubts.
I have no qualms believing that Kathz reached whatever levels of awesomeness in Japanese in 18 months, from the first descriptions of his methods he was spending some disproportionately high amount of time messing with the language, it would actually be weird if he didn't get a good grasp of Japanese after spending 12~16*540 hours with it. And I'm sure that looking back and making some adjustments he could devise a somewhat better method.
Now, I don't know the silverspoon routine and it looks like no one is willing to answer the question "how much time do silverspooners spend on Japanese everyday?", but assuming that that time doesn't exceed 6-8 hours/day, I don't see how he can guarantee that a method he hasn't tested can bring others to the same results as him in less than half the time. It just seems too big of an assumption to me.
That, and his description of fluency just seems weird to me. I think I'd struggle with some of those points in my native language even, and they don't seem that strongly linked with understanding/command of the language to me.
Also, though this is just a pet peeve of mine, I really hate when people say "understand 95% of stuff". I'm aware that it is more of a figure of speech than a reliable statistic, but do people realize that it would be actually a really low level for it to be called "fluency"? It could be as bad as missing the meaning of a sentence per page, or having to use the dictionary for a few thousand of words when reading a book, doesn't really sound that fluent to me. Actually I remember reading somewhere (was probably something linked in this forum) that that kind of understanding is considered more of a starting point to be able to learn from reading/listening.
Sorry for the long rambling, I rarely post so I tend to make up for it with length