I know others have complained about the look of this bra compared to the photos in the advertisement.  I definitely recommend using the cup liners that come with the bra- without them, this bra IS thin and does not have a 'smooth' cup appearance.  I've been very pleased with wearing this bra with the cup liners under t-shirts- it doesn't appear at all that I have a nursing bra on.
I wear this bra at night too and it offers GREAT support- I tried going without it and my breasts were very sore.  The sides are easy to unlatch/latch and the 'clasps' seem pretty heavy-duty.
I have been very pleased with this nursing bra and now own two of them.  They are a little pricey, but I like the look of them and the support they offer.
I'd definitely recommend!  The sizing was pretty right-on too- I wear a 34B and ordered the small.

UPDATE: After 7 months, the bras are still in good shape, however the inner elastic straps (on the inside part where the cups unhook and flap down for feeding) are really getting stretched out/worn out.