This bra is the most comfortable I have ever worn. I bought two for my mother as well.

Don't doubt the Bali size guide.  It is accurate.  If you wear a 34 band, you will need a small or the band will be too loose even on the tightest hooks.  That said, if you are larger than a D cup, the small bra might not work for you because the cups, while stretchy, only stretch so far :-)