Walt's full review of the Lenovo Thinkpad X300 is now available. As usual for the man, you also get the bonus (or burden) of a detailed comparison with Apple's competing product which in this case is the MacBook Air. For those of you who remember Walt's MacBook Air review, that quote -- "I can recommend the X300 for road warriors without hesitation" -- stands in stark contrast to Mr. Mossberg's take on Apple's beautiful but compromised ultra-portable. As Walt points out, the biggest differences between the two are the selection of ports, built-in DVD or second battery, and a removable main battery afforded by the X300's relatively thick chassis. Of course, the choice of OS is also a consideration since the X300 can't run OS X while the MBA can run Vista. Walt does lament the fact that the X300 is only offered with an SSD. As such, it's limited to a maximum of 64GB of storage and contributes to the X300's relatively high price tag. It starts at $2,500 with a stripped-down, half-sized battery and no DVD -- $3,000 gets you the more popular full-sized battery and DVD config. Walt's aggressive, full-size battery tests resulted in "weaker battery life" at 3 hours and 5 minutes compared to the MBA's 3 hours and 29 minutes. That said, the Lenovo easily trumps the MBA with 5 hours and 15 minutes of juice when configured with both a full-sized and half-sized battery. The choice seems pretty clear at this point: form or function, which will it be sir?