From memory, I think you do have to provide details to register on the Hornby forum. I did it once so I could enter the competitions.
Hornby's forum is very much train set world but everybody has to start somewhere and that is the general level of chat there. This forum has a broader spectrum with some very knowledgable individuals. I've never met anyone in my life who knows more about model trains than Ozzie. But it takes a long time to accrue a lot of knowledge about this subject given it's breadth. Most people on this forum have specific areas of expertise. Most people on Hornbys wouldn't.
The chat on Hornbys site will be tailored to Hornby product but lets face it thats why it's been provided. I don't think it is impartial but given the people using it I don't think it's that important. They are unlikely to be looking at other product anyway. The average user has got a train set and is thinking about adding to it and may not be sure which way to go. I think it's a good facility for the beginner to get basic information which wont be confusing and them not having to go to far from what they know. It's the first step in a learning curve.
Dennis, if I want to read my catalogue in the toilet I print off the relevant sheets from the website. They could also come in handy in case of emergency too.
Seriously though catalogues are good to look through. I stopped buying them as there didn't used to be much change from year to year. I may buy a Hornby one to see what the latest one looks like.