These stairlifts are designed for curved stairway constructions such as spherical stairs, or switchback stairs. It needs a longer time to install and their price is relatively high compared to straight stairlifts. Call now for a free no-obligation in-home evaluation with a guaranteed price in writing 888 532-3834 (Click To Call). Stannah Mountain West Stairlifts is a trusted, reputable, experienced, and professional Stannah stairlifts dealer in Mountain West.