This thing has lots of problems:
1- front is ridiculously pointy for men's shoes- will push one spot out, usually not at the longest part of the front, because there is no left or right model so the point is down the middle  (I plan to spend time in the woodshop re-shaping it)
2- can only spread or lengthen, not both at the same time
3- the action is very hard to understand- I am a mechanical engineer, so I understand how it works, but you may find it hard to figure out.  Experiment and watch before putting it in the shoe
4- very hard to get into the shoe even at the shortest setting
5- hard to get the long stretch at the longest setting- lots of fiddling and counter-intuitive action- see above
6- seriously overpriced

That said, it sort of works, has definitely helped me with a pair of favorite shoes, and MAY be the best thing out there- but it sure needs improvement and I SURE HOPE THE MANUFCTURER READS THIS REVIEW!!