I finally made the switch from ZStick gen 2 to gen 5 and thought I would share some observations. My Zwave environment is around 25 devices and I made the switch using the exclusion/inclusion method for each device. My iMac is located upstairs and all the devices are downstairs. I used the gen 2 ZStick to exclude a device and my iPad running Splashtop, a remote access to the iMac, to perform the inclusion. Actually things went much faster than expected.
I installed new GE in wall dimmers and switches with toggles. They are somewhat smaller than the previous generation and they automatically figure out line and load connections.
I could not back up the new gen 5 with Fusion on the iMac. It seems as there is no flow control on the ZStick data and any loading of the cpu by the system, etc, forced a loss of data. I eventually used a borrowed PC laptop to generate a backup file and create a second ZStick.