Does what it is supposed to do well.  Mix 50/50 rubbing alcohol and water and pour it in the boot (then pour it in the other, then pour it out), or spray it (paste or wax can prevent exterior penetration so best from inside), saturating the leather then insert and twist with or without expansion nurdles.  One reviewer stated it needs two universal joints; this joint is designed to only need one joint and it works well.  Seems to be good quality materials, wood and metal, with plastic nurdles for bunions, etc. I recommend this product highly. 5 stars.