Martin_R, I think one of the big reasons folks are asking these questions is the cost of the Triumph branded Racing 4T. Even a diy oil change sets you back nearly $70 when using their oil. That was the main reason I got into the discussion on various threads.
I went so far as to buy a bottle of it as well as a bottle of the Mobil 1 15W50 from a local store and pay $45 to have them both analyzed just to see how much difference there really is (the stuff from my local store is less than half the price). You can find the results of the analysis here:
http://www.thespeedtriple.com/Forums/index.php?;tpstart=5
about the middle of the page.
I just have a hard time swallowing $53 a gallon for an oil that may or may not be worth that much. Myself, I doubt that I'll be paying that much for a second bottle of the stuff based on the analysis....but bikes are personal property and, as such, subject to personal opinion.