Lenovo's ThinkPad X1 Tablet modules add features but limit functionality

We gave Lenovo’s ThinkPad X1 tablet high marks not for its performance, but for the elegance of its design. We can’t say the same for its three add-on productivity modules, as their price and bias toward tablet mode lower their appeal substantially.
Modularity has emerged as a theme for Lenovo, home of the Moto Mods and Thinkpad Stack modular accessories. Now a series of three “modules” do the same for the Lenovo X1 Tablet: the $150 Productivity modul