The band size is rather tight for a 30. It's not really bothersome when I'm standing, but it cuts into me when I'm sitting for a lengthy period. It didn't really stretch out even after I wore it a few times. Cup size is also a little small. It may fit seemingly fine when you put it on, but once you start moving, you wont stay in it. The straps fit comfortably. They don't slide off the shoulders and are wide enough that they don't cut in.
Love. Love. Love. This bra. It is adorable with smooth satin on the bottom half and lace on the top. Wonderful attention to detail in the craftmanship of this bra. Love the rounded shape and the support that it gives. It's band runs definitely smaller than any of my other 30 size bands. I wear this bra on the loosest hook and there's not much give. Haven't worn it much yet so I don't know how it will stretch. If I had to order again I would probably order a 32 just for comfort. Also, the cups are a bit small so if you run between sizes you might consider ordering a cup size up as well.