I have just about every possible nursing "sleep" bra there is (yes, really), and this one is by far the most comfortable for me. This bra is very soft and does not ride up, cut-in, or irritate my skin. I am a smaller woman (32A non-nursing/pregnant) and sleeping on my side can be uncomfortable with certain bras because the seams and elastic bands often dig into my ribs; this bra is the best and preventing most of those issues. I have ordered more of these bras to use on weekends when I am at home relaxing.
The size M was scary at first (again, I regularly have a smaller chest), but it fits well enough to provide sufficient bed-time support and overnight "growth".
My only con (as with all sleeping bras so far) is the location of the seems for side-sleepers. I wish somebody would move the darn seems so I could sleep without ANY seems digging into my ribs!