I am giving this 4 stars for the quality of the fabric, but that's about it.  It is extremely difficult to obtain the double cross back look that this suit is designed to do.  I modify this top by placing the left string into in and out of the right loops and the right in and out of the left side hoops, which creates a single cross back and allows better control of tightness.

If you look at the photos, it is clear that there is no fabric under the arms.  I prefer the single cross back that actually has fabric wrapping around the underarm area and where the string has a pocket to go through in the back.  Be aware that if you raise your arms above your head, there will be under bust peeking.  I purchased the largest size for a 40C bust.  There is adequate coverage.