I prefer T-back bras because I absolutely hate when a bra strap falls down on your arms.  I have 2 old ones that are well past their prime, and I have not been able to find any in stores to replace them, so I came to Amazon.  I bought 2 bras.  This Bali one and the Wacoal Women's Front Close T-Back Bra #65124.  First off, the Bali is $16, and the Wacoal was $44.  I loved the Bali one, and am returning the Wacoal one.  You can see my review of the Wacoal (too tight/small, too thin, too scratchy, too expensive...if it was fabulous, I'd pay $44), but this review is of the Bali one.
This Bali bra is:  1. It is well padded, but not overly padded; 2. gave plenty of support; 3. Im 5'1" and 135lbs. and typically a C...the size chart showed me as a 36C.  This one fit perfectly.  No fall-out at all. 4. If I had to sleep in it, I could.  It was that comfortable.
It is not really dainty, but it covers and supports well, which is what you need.  I also like that the "T" in the back is not really high up (my others go way up the back and it actually shows in some shirts that have a sheer fabric or low cut.  Also, the straps aren't real close to the neck, so shirts with a large wide collar (boatneck style) these straps are further out than typical T-straps and don't show in shirts that my other bra straps showed in.

ANd the price...$16--GREAT!...since the other one fit, I went back and bought another white, and a tan and black.  So glad to have bras that look good, feel good, and do what they are supposed to do. (so I actually bought 3 of these bras for the price of ~1 of the Wacoal bras)

Have only worn this bra once, so can't tell you how it will hold up in the long run...washes, etc...But all bras over time lose elasticity.  SHould it not hold up to typical wear and tear, I'll definitely adjust my review, but for form and fit, this one is 5 stars.