This product is awesome for someone who doesn't own a racerback bra!  It definitely holds your straps in place. The little clip feels cheap but as long as you're not folding it in half, it won't break on you.  It's not difficult to attach to your straps either, but if you can't reach back there, the instructions give you two different options on how to assemble the clip.  I definitely recommend the product!

Oh!  And the package comes with adhesive strips that hold your tops in place!  I usually have problems buttoning my tops around the chest area, and these strips work wonders!  They can also be taped to your body to hold up strapless dresses or to hide areas that you don't want seen, especially while you're at work!