Independent testing on after market columns shows some to be dangerous. OEM are designed with fail safes to prevent loss of steering if a component fails. Not all after markets have this feature.
http://lvvta.org.nz/documents/infosheets/LVVTA_Info_01-2013_Unsafe_Aftermarket_Steering_Columns.pdf
http://lvvta.org.nz/documents/infosheets/LVVTA_Info_01-2013_Unsafe_Aftermarket_Steering_Columns.pdf