I have put off getting boot trees for a long time now because I know how expensive they can be (especially when you have a collection of over a dozen boots that need them!).  Personally, I think these are a great solution; they look nicer than sticking magazines or pieces of cardboard in them like other reviewers have suggested.  Plus, when you take them out of one pair to wear them you can just stick them in another pair in the meanwhile.  Actually, given how expensive magazines are these days, a pair of these is probably cheaper.  I think they're a decent value.  The only downside I've noticed is that the plastic/vinyl attracts lint/dusty particles because of its magnetic qualities.  Still, I'm happy with my purchase.