I have used the Bounce dryer bar for over 2 months.  The first time I used it, it fell out of the holder, but has since stayed put.  It works very well - no static.  I never thought throwing in a dryer sheet was a big deal, but it's been enjoyable just throwing clothes in the dryer and never having to think about a dryer sheet.   After about 2 1/2 months (about 8 loads a week), it is probably about time to change the dryer bar.  So cost wise it was no more than a better brand dryer sheet.