I have a terrible time with new shoes.  I always end up with blisters before I manage to get shoes broken in properly.  I've tried a few different types of shoe stretchers, this is by far the best I've found.  The others I've tried tend to break after a while and just don't last long enough.  These ones are heavy duty.  I tried them with the Bravo-fit Shoe Stretcher Spray too.  Worked beautifully!  No more foot pain with new shoes!