It was more than two years ago that Lenovo announced the ThinkPad Helix, a detachable tablet-laptop hybrid billed as a great alternative for the worker on the go. Now that low-power Intel Broadwell Core M CPUs are out, Lenovo is back with a refresh. The 2014 model has largely the same feature set as its predecessor, but Lenovo claims it's now 15% slimmer and will last several hours longer on battery. It's also about $500 cheaper than the original Helix.