Hey guys, I just found this thread whilst looking for a similar thread I replied in a couple days ago relating to ICS and I think it's appropriate to reply here.
First of all, I have been a member of ICS for around 18 months having paid for the entire first year course (although FAR from having worked through it all) and now 5 months into year 2, although I havent' really worked through that material either.
I am also on the ICS Forum as Bilbo and therefore know BDK fairly well and I think can speak for him in his absence on this.
First of all, the ICS Forum is just a free forum set up by BDK who has nothing at all to do with the actual ICS team. It's completely unofficial and I'm not even aware if the actual ICS school are even aware of it, although I presume they must have noticed it by now. Anyway, it's just a forum that BDK made up for those of us doing the course to discuss it. A few of us joined around the same time and I guess it made sense to set it up.
Secondly the 'GM' rank that he has on the forum is purely to do with the number of posts he has made on the forum and has nothing to do with his actual chess grade!
He's most definitely not a shill, just a chess improver who started the course a couple years ago and then set up a forum to discuss it with others. I've not spoken to him for some time but I'm presuming he's still continuing with it. If you view his blog you will see he has experimented with many books and material etc, ICS being just one of them.
I think, like me, he would recommend the course with a few reservations. The material can be difficult and requires a big time commitment. The English of the teachers is sometimes not the best and can feel rather unnatural at times, although I have never found it hard to understand what they are saying. It's more quaint and endearing to me, but might be annoying to some.
As to the perceived value, compared to books I'm not sure. Generally there is around 80 or so pages of PDF material a month, less on exercise months. You also receive a lot of chessbase database material as well however which of course you wouldn't get in a book. Having their opening reportoire in both pdf and CB database format is very useful to me as when I buy a printed book I invariably have to spend many hours entering it back into CB format, and ICS saves me many hours having already done it, which to me means it is definitely worth the money.
As an counter example I purchased Artur Yusupov's Build Up Your Chess workbooks which seem excellent but I gave up after a few chapters because I just found entering them back into CB format was too time consuming. With ICS I get both PDF for reading and CB format for playing over the moves so that is a big plus.
It's also fairly unique material and I've had good success with the opening reportoire as I think few people know these lines. How good they would be at GM level I don't know, but as I am currently around 140 ECF I don't care either.
All in all, it's a good course, well worth the money if you are willing to put in hard work. If you are a more casual learner however you will gain little from it and would be better served with books and videos.
I looked at this site, and concluded that it's main value was in how information is collected. Most amateurs bounce around from one topic to the next never mastering any of them and collecting lots of "knowledge" but not enough "skill".
The real value in a system like this or proper coaching is that you save time.
Example, most amatuers have a random opening repertoire based on either what books they acquired or based off their "style" of play. Even worse, they jump from opening to opening-
with a coach or a system like ICS you should end up with a fairly complementary repertoire that makes sense together instead of something cobbled together.