The acorn technician that installed the stairlift was very informative and helpful. Very minimal installation concerns and very unobtrusive. Did not damage walls or stairs.
The lift even worked during power cuts and it came with a great instructional DVD.
Look to get second-hand ones as acorn does not buy back or resell. Many can be in great shape but they are hard to get rid of as people don't like to buy without a warranty.