The Z Plus has a single mounting point for the router mounting collar. The Belt Drive X/Z has two mounting points one higher and one lower. Depending on where the user installs the mounting collar on the Front Z plate of the Belt Drive Z axis, there are two different operating heights. The Z Plus advertises 3 inches of travel and provides more than that. Your reach is different from that of the lower mounted point of the Belt Drive Z axis. There are 2 options for reaching work when using the Z Plus. A longer endmill or lifting the work up with say a spoilboard.