Be careful about the Schindler 3300. I admittedly don't intimately know the product, but it is my understanding that most of their own mechanics are not able to work on them unless they have gone through training. Due to a settlement with Otis over the belt technology they are unable to monitor the belts remotely which requires they be replaced after a specific amount of runs.

As for non-proprietary - I don't see the benefit. In the new installation market you are talking about a $100,000 upcharge for an MCE package over an OEM (total selling price difference). Sure you can say that anyone can maintain it, but you can also pay for 60 years of maintenance through the OEM at that price difference. So where is the true benefit to the owner? Save money in 60 years by dumping all that money now on the product that will become obsolete in 10 years?