Well I got the N8 after tha N900, then the SGS2 and now the N9.

And the N9 is by far the best allround device Ive bought. SGS2 has its virtues, as does the N900 and even the N8, but N9 wins hands down.

SGS2 has more apps, bit better screen, larger screen.

N900 has the HW keyboard and the openness of awesomeness.

N8 has a mad camera and good free navigation.

N9 has a good camera, free navigation, great screen, good app (more every day), openness, a good VKB... In addition the UI is better than the other three imo, its physical design beats all three... All in all it just does what I want from the other 3 devices, in one device. Plus extras.