Cost was a big factor at ~$400k. Also, it was heavy (~100 kg IIRC) so it shook the whole house going up stairs. Also, it was too wide for stairways in older hou

Cost was a big factor at ~$400k. Also, it was heavy (~100 kg IIRC) so it shook the whole house going up stairs. Also, it was too wide for stairways in older houses. And, if anything went wrong halfway up the stairs, you'd be going down ass-over-teakettle strapped to something metal weighing more than you. All those things could be improved on. Maybe Mobius will succeed.