There is a lot of knowledge over at those forums, and a ton of opinions that go along with the actual knowledge which causes headaches.
My biggest gripe there is that if you have a single real question about any product, your post always gets deleted and you are asked to stick to the official product thread. While I understand this, quite often those threads are a thousand plus posts long, and your information may or may NOT be in the thread.
What's worse, is that while there are a lot of tweakers there, the number of people with real world day-to-day A/V experience tends to run rather thin, so if you ask a technical question, you quite often don't get a good answer when it comes to more high end and techie questions.
They do have a few forums which are really nice such as their media players forums which get some activity but not as much as much as their other forums and actually have some pretty bright people in there that aren't overly hostile.
Sometimes their forums are great, but they aren't as consistently solid as what we have here for sure and I won't bash them for just being a bit 'large' at times.