Samsung back is metal infused on plastic base, i.e. it is essentially plastic. Samsung Tab build quality is superb, superior than Asus. However: 1. Samsung has no HDMI port = no go automatically. Even with accessory shoes through the main port, not good since you cannot charge simultaneously. Not to mention the accessory price
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2. Samsung Tab No SD card = several hundreds $$$ surcharge for memory expansion = iPad. At this point anybody will simply buy an iPad...
Price: At this time of the year anything pricier than $300 is worthless. I bought the Asus at introduction for $400, and I don't regret - GPS, e-mails, Skype, portable movie player, Netflix to TV via simple $2 HDMI cable, WiFi media streamer, games ...However, Windows 8 Dev review is out and it is working very very well on Asus 1005 tablet, so unless in the next several months somebody brings fully fledged OS with all kind of SDKs and network/server integration, there is no point to waste big $$$ to a non-windows tablet. A fully functional tablet PC is in practice already available, and the OS will be retail by the mid-1212.