ThinkPad X series the presence of a 12.1-inch Thin-film transistor (TFT LCD) display. These design values – thin and light – continued to be a part of the ThinkPad X-series laptops even after the purchase of IBM’s Personal Computing Division by Lenovo. The first X Series ThinkPad released by Lenovo was the X41 in 2005. The ThinkPad X-series laptops from Lenovo were described by Trusted Reviews as combining an ultraportable's weight and form factor with a durable design. The X-series laptops include traditional ultraportables, as well as convertible tablet designs. According to Lenovo, the ThinkPad X-series laptops include low power processors, offer long
ThinkPad Enderle said that the constant thing about ThinkPad is that the "brand stands for quality" and that "they build the best keyboard in the business." The ThinkPad X Tablet-series was PC Magazine Editor's Choice for tablet PCs. The ThinkPad X60s was ranked number one in ultraportable laptops by PC World. It lasted 8 hours and 21 minutes on a single charge with its 8-cell battery. The Lenovo ThinkPad X60s Series is on PC World's Top 100 Products of 2006. The 2005 PC World Reliability and Service survey ranked ThinkPad products ahead of all other brands for reliability. In the 2004