Not sure about that. Using bluetooth adapter with microphone (like ultracheap and very reliable and moddable BH-214) or bluetooth headset + voice calling, one can pretty much perform any telephony task without even taking Pyra out of bag. It's rather thing of habit to bring telephone to your ear, rather than actual usability (yes, I do it all the time, even though that I *know* using bluetooth headset that I have would be much more convenient - actually, tested it few times and it was great).

The point about nice integration in system is more valid, although, times where desktop systems lacked perfectly usable phone/SMS/phonebook stacks are long gone.
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All benefit of Neo900 is (apart from obvious attachment to Hildon - i focus on hardware side, now) replication and extending unusual features of N900, like awesome resistive screen (sad that it's unusual feature nowadays), IR, FM receiver and transmitter, etc.

From my perspective - basing on the current known hardware choices - it all boils down to if Neo900 is going to support video out in any conversion-less form (VGA, DVI, doesn't care if it's through some micro port in motherboard that need hacking custom passive adapter, or via (ab)using microUSB displayport implementation). If it lacks this feature and Pyra got it, I probably switch allegiance immediately - even without any modem in it (keeping my N900 for all cellular needs and networking).

I'm sick of using composite video out for my "transform to desktop" needs. Nothing like sitting with BT or USB full-fledged keyboard, with mouse in your hand, and N900 as main unit - using big LCD TV (that are everywhere, now) as monitor - except looking at crappy 768x461 downscaled from 800x480. Eh... I should probably be glad (and I am) that N900 have this feature at all, as it's very helpful.

But, if Neo900 skip this feature that is absolutely in their reach without much hassle (via the "any random, easily obtainable socket on board, that have enough pins for vga", and leaving making adapters/adapting case to user's discretion), I think I become "mad as hell and cannot take it anymore", becoming "traitor" myself

/Estel