We installed the Amazing Auto seat swivels which are the only option for the 10 way power sears. It seems as though there are manufacturing variations both in the seat swivel and the Ford Transit seat riser as many people report wildly different experiences with the installation experience. For us, it was OK, but we had to hammer down two little tabs on the riser so the seat swivel's holes would line up with the riser's holes. Not a big deal.
One other area of installation disagreement is if you need to disconnect the battery since you are disconnecting the seat wiring which is connected to the air bags in the 10-way leather seats. We did disconnect the battery, but I don't know if it was necessary.
After the installation, I can see it was always going to have been be a huge pain in the butt to access the starter battery under the driver's seat. With this (any?) swivel installed this just get worse. I am planning to add external terminals so we could jump start or charge the van without taking apart the driver's seat.