If you want to separate Discovery 3, 4, 5 from the earlier series, then I would say that is a good call. I spend most of my time on the Http://www.d2bc.co.uk forum, as having D2, that is a place dedicated to the D2. In my opinion, the kind of help, support, and information available through a more dedicated forum, is far superior than via a general one. I personally see no reason why a forums website cannot provide dedicated areas for each different model; what practical difference does it make how much "traffic" each one would attract?