i was able to use lumia 900, and it's just like lumia 800, only bigger and with a front facing camera... and oh, 4g enabled, but you won't really need that since everywhere is a wifi zone..

sure the design is similar to n9, but it's bulkier, heavier and i don't find it better than n9 in most ways...

sure its camera app is better, but less compared to other phones at its price range or even lower,
there's more apps available for it compared to n9, but who needs over flowing apps if n9 has most (if not everything) that you need?
and it's got a dedicated cam button, better battery life, and a bigger screen.

n9 on the other hand have nfc, usb mass storage support, higher screen resolution, and has better ram... and lighter too..

besides, if you want to buy a windows phone, why not try the upcoming samsung omnia m, or the samsung focus? reviews said they're good, minus the camera.. (only 5mp)

if you wanted lumia because it was dubbed as the best smartphone, better buy the s3 or just wait for iphone5... their price range don't have a significant difference.. and they are supposedly smarter than lumia. it has single core processor compared to others having dual or quadcore.

i have to say that there's a reason to buy lumia 900 --- its social integration capabilities. however, if socialnetwork integration is what your looking for, better look for other windows phone that are way more affordable than lumia..

believe me, you'll just waste your money with lumia 900. there's no reason to commit to the new lumia, not when the same amount of money (or even less cash) enables you to have a much more capable windows phone, android or ios device.

hope i helped.. D