Big issue with the tailwheel C 150 is the type of landing gear legs installed. Some conversions just reuse the tube gear by turning it around and installing it in a new more forward gear box. These conversion have terrible ground handling because the three point attitude is too flat and the tube gear allows the wheels to toe out if you touch down with any drift, and toe out equals very directionally unstable. I would stay away from these unless you were an experienced tail wheel pilot.
The best ones use the flat spring style gear that is either re arced to make the airplane stand higher or use C 170 gear legs.
The best C 150 tail draggers are conversions of the early fast back square tail models, the post 1965 models with the back windows and swept tail lack adequate rudder authority.
Personally I would buy a C 120 or C 140 before a converted C150 anyway. They were purpose built taildraggers and have wonderful flying characteristics and relatively docile ground handling.