I put a request in for the PAS sensor that mounts directly to the arm to see how they respond. I looked through the support section and they have a nice feature offering video conferencing during the installation. On the down side the 1st appointment was 10 days away. They have a lot of support and guides and admittedly I pushed on without relying too much on them with mixed results.
Overall I found the PAS sensor system the most challenging. I would say it is critical to have the right one selected if you want to pop the system on and go. I probably lost 2 hours between researching how to modify the sensor that came with the kit and adjusting it to fit.