This is a fantastic bit set. This was my first set of Sommerfeld bits and I have already ordered more. Raised panel doors are perfect, and the height-adjustable pieces work exactly as they should. I bought a tuning tool along with a kit that worked great. As for quality: cut quality was good on all bits (no flush cutter was used), the slab cutter is huge but gave a great cut even with a small cutter motor (2 1/4 hp), excellent use of the socket collet and now I use them for all my bits and allโฆ