I own the Feickert and find it both useful and easy to use.
FWIW, I also own the "Turntable Basics" phono cartidge alignment tool (mirrored). I also own both the "TT Basics" and the Shure stylus force gauges.
For folks like me, with a combined investment in table/tweaks, cartridge/stylus and phono stage of $2000, the "TT Basics" alignment tool plus their little seesaw stylus force gauge for $35 total are the only tools needed. I do find the Shure gauge easier to use...but no more accurate.
FWIW, I also own the "Turntable Basics" phono cartidge alignment tool (mirrored). I also own both the "TT Basics" and the Shure stylus force gauges.
For folks like me, with a combined investment in table/tweaks, cartridge/stylus and phono stage of $2000, the "TT Basics" alignment tool plus their little seesaw stylus force gauge for $35 total are the only tools needed. I do find the Shure gauge easier to use...but no more accurate.