Thank you very much for the advices.
I m glad to see that I am not the only one with this existential doubt down there.
I ve read a couple of times that North entity would not adapt always well with other standard kiteboard, or at least it could force you to use a weird setting.
Pity because they were much cheaper than the Apex from Naish.
As for Nobile pads, I just came back from Paros (greece), which was used as Nobile test center, and the general consensus there was that their pads are so hard that it is as if there was no pad at all. The good thing is that you can feel the board very well!