Thanks to all for the great feedback from all on this site. I have 2 remaining questions:

1) What is the cost range to install a GAL AT400 conversion kit?
2) Can someone help me understand the wide cost range for an Otis Glide A?
- At the high end, Otis wants $18,000 EACH, but only if we bought 5 units for a TOTAL of $90k. Otherwise, they would be $30k each.
- At the low end, someone bought a single Glide A for $4,700.