This is a tuff tool and worked well to remove a layer of deco concrete from a interior slab floor. The tool gets very hot so use the special Advanced lubricant tube supplied every time you use it to lube the shank. When the lube tube runs out switch to Mobile SHC 32 grease. I have 2 improvement suggestions hence the 4 stars. Number 1 is that the gasket which seems to be made out of GP03 which is a fiberglass reinforced polyester resin does not have a sufficient working temperature range and begins to break down and fall apart due to the heat generated by the scrapper. Standard Teflon has a much higher temperature operating range and would provide a gasket with longer life. Number 2 is the lock washers get loose often and require tightening. This leads to bolts being sheared. I switched them out for Nord-Lock washers and stopped the bolt shearing because they stayed secured longer. So instead of tightening the original lock washers several times a session, I only had to tighten the Nord-Lock washers once. If Vevor supplied Nord-Lock washers which are used in pairs so 2 pairs per bolt, it would be a well needed and appreciated improvement as the Teflon gasket would be. Blessings!
Tom 
Dave c 
Daniel 
Adalberto 
