Pretty comfortable and supportive for a nursing bra, and held up to a lot of wear (measurements are based on a newer bra, though I also have an well-loved bra of the same size/style). Band was quite snug, bordering on tight, at first (I should have gotten an extender), but eventually stretched a bit and felt very firm yet comfortable (old bra measures 39" stretched/33.5" unstretched). It doesn't extend much in the straps - I didn't find this to be an issue though some might. 4 hook design felt very secure. It definitely felt like a LOT of bra, if that makes sense. Finally, after a year of fairly heavy use, the underwire is poking out of the bra on one side, though that's a pretty simple repair.
When I went for my bra fitting, I specifically asked for a smooth-cut style bra to wear under sweaters and t-shirts. While the fitter measured me as a 36FF, she assured me that a 38F in La Mystere was equivalent to a 36FF in Elomi.
I'm pretty sure she pushed this bra on me just to make the sale, as when I wore it yesterday for the first time I found that the underwire digs into my underarms and the center gore doesn't lay flat, which causes the bra to gap a bit at the top.
Overall, this is NOT a good bra for me. I can't say if it's the La Mystere brand in general or that this is simply the wrong size bra. After measuring the depth of the cup, I can say it's definitely way too shallow for my breasts and the band is way too big.