One of the major upgrades to the 635 is its new cab, designed with improved access, visibility and layout. Despite appearing not to open far, the sturdy one-piece door hides a cut-out in the cab floor above the step. This allows you to easily swivel in and out of the cab, rather than the usual climb. The void is filled with a decent-sized door pocket when closed. A thick rubber floor mat can be removed without need for tools, and two large bungs lie beneath it, allowing any water to be drained away.