Experience of car rollers

[MK 2 GT6]

Has anyone experience of using a car roller, similar to CJ Autos 1400 / 1700 ?

 

would value any comments, especially around what sort of ‘ footprint ‘ and height requirements they need. Do you get good welding access ?

would be using on. GT6. 

garage layout does nor permit a rotisserie arrangement.

 

many thanks