The negative reviews of these bras on this site are a mystery.  I almost didn't buy one. I had to await several days for  a risky mood to click "buy".  Many say the bras have no support and should only be used to sleep in.  So I was very surprised when I took one out of the box and tried to stretch it .  It fought back! I wondered if I was going to be able to stretch it enough to get it over my shoulders putting it on.  But no problem.  And it wasn't of flimsy fabric as indicated in the reviews. I put it on and it hugged me with  pressure.  Yet very comfortable.  I'm 5'6" , 158 lbs, small bones,  38C. I bought Large.  I have no clue what being a DD or DDD or E or F is like!  Maybe you gals need hammock canvas or tire rubber to support your girls.  But for the rest of us average girls,  the Ahh bra is a God send.  I would call it "serious support".  Maybe not for jogging.....but I'm curious. I'm going to try it. If I hadn't read all the negative reviews, after putting it on,  I would guess it might be good for jogging.  My question is....Where did all the negative views come from?  Maybe competitors of the Ahh bra.  I know that happens online.  Or, some people are just, "no", people.  They are never happy. Some like to complain.  It's beyond me.  But after actually having an Ahh Bra on my person,  I would say that this bra is not a scam.  It's a very comfortable, supportive bra.  Try it . Amazon stands behind it's sales.  That's why their stock hovers around $200 a share.  Their # of sales has gone from 14 mil in 07 to 48 mil in 2011. We're all here for the same reason. It's the best shopping place online. The best prices, the best shipping (mine took 4 days)and most important for this purchase,  the best return policy.  They don't want to lose one customer.  I'm peeved about getting all in a quandary for nothing.....in case you didn't notice.