MojoKid writes: Asus unveiled its latest addition to the Transformer series at CES in January, the Transformer Book Chi, which just recently began shipping. Available in three sizes, the new Transformer Book Chi Series features a 2-in-1 detachable design. The flagship Transformer Book T300 Chi offers a 12.5-inch screen, an Intel Core M processor, and a fanless cooling solution. The 2-in-1 detachable design employs a magnetic hinge that supports four usage modes: Attached, Detached, Flipped, and Tented. The T300 Chi measures about 0.65 inches when docked, making it slightly thinner than an Apple Macbook Air. Asus claims the T300 Chi is the world's thinnest Windows tablet, measuring just 0.28 inches thick. More interestingly, perhaps, is that Asus built this machine with Intel's fastest Core M chip, the Core M 5Y71. In the benchmarks, it competes well even with full-sized ultrabooks, though battery life does take a hit due to the system's mechanical limitations and smaller 31Whr battery. At prices from $400 to $900, this might be an interesting choice for anyone considering the new Surface 3, too.