I bought this for yoga. I have an ample bosom and felt like my girls where trying to strangle me in down dog. This combined with a high neck tank or body suit seems to do the trick.

It does stretch out a bit over time and the bottom band tends to roll. I do have to adjust myself every once in awhile but thats nothing new.

I have not tested it out as a "hold em in" high impact bra or a shock absorber. I think once you get past a DD, thats pretty impossible without duct tape.

Update 9/22/2011 - I wear this 2-3 times  a week and its holding up really well. I even wash it in the washing machine with confidence. Its very comfortable and great for control and perfect for yoga. The only minor negative is sometimes you have to be careful with the type of top you wear. If it has a boat neck or an scoop the top and sides of the strap fabric will show.