I was surprised at how well the unit was constructed and thoughtful design.  The unit assembles with male and female joints allowing easy transportation.  The wheels are large and smooth enough to roll over most debris on a sheet rock job.  The frame that holds the sheet rock is spring loaded to allows slight movement.  Thisallows you to adjust the sheet rock around interferences.  The triangular wheel base collapses so that you can roll in through doorways and such which is very convenient.  You just need to remember to extend the wheels when you're back to lifting sheetrock.