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Asus Transformer Book X300
The Transformer line from Asus has been around for years, starting with Android and now with Windows 8. The X300 is heavy but that's expected in such a large tablet.
The full laptop dock has a battery that extends the life of the tablet with its own battery.
Asus Transformer Book X300 configurations:
Processor Intel Core i5, i7 Display 13.3-inch (1,920x1,080) Weight Tablet: 0.95kg; Dock: 0.95kg (with battery) Memory 4GB Storage 320GB - 500GB HDD with 128GB SSD Battery 8 hours Price $1,499
Dell Venue 11 Pro
The Dell Venue tablet line has a number of solid peformers. The Venue 11 Pro is a good compromise in size for both the tablet and laptop functions. It is unique among Windows hybrids in that the battery can be swapped on the go for limitless battery life.
Dell Venue 11 Pro configurations:
Processor Intel Atom; processor (Quad-Core) Display 10.8-inch; HD LCD (1366x768) Weight 771.5gm (1.57lb) Memory 2GB Storage 32GB - 256GB Battery User replaceable Price $429.99
HP Spectre x2
The Spectre is a business class tablet with a full laptop dock that turns it into a laptop replacement worthy of the mobile worker. The Spectre has surprisingly good battery life for such a large tablet.
HP Spectre x2 configurations:
Processor Intel Core i5 Display 13.3-inch IPS (1,920x1,080) Weight 2.18 lb (tablet); 4.39 lb (tablet and base) Memory 4GB Storage 128GB Battery 12 hours Price $1,099