This bra is FANTASTIC.  I ordered one initially and have since ordered several others.  I have worn 2 sports bras my entire exercise career and have still not had comfortable support.
This bra has changed all that.  I wear it with a T-shirt and have minimal movement.  It is extremely comfortable.

My warning- you must know your exact back length- this band has zero give.  I was actually measured in a bra store and found the bra hard to get on at first because even normal bras have more stretch to the band than this one.  But after a while you get the hang of it.  A cool feature of this bra is that the strap lengths are actually adjustable.  They are velcro-ed in the front, which was very convenient and I haven't had any trouble with them slipping or moving.
All that being said, I ordered my exact normal bra size and it fits like a glove; I didn't have to go down one size to ensure a snug fit.