This does a reasonable job of catching let down from the opposite side while I'm expressing. I also like that it evens my chest out a bit so I don't look completely lopsided when I'm pumping!
The need to push the centre to regain suction is unrealistic - I use elvie breastfeeding products for discretion at work and would look mad pressing my breast in the staff room!
I also find it difficult to empty the curve, especially into milk storage bags. I would rather it either attached straight into a bag or was comprised of more, smaller pieces to make emptying and sterilising easier (it only just fits in my cold water steriliser with the elvie pump parts. I have to sterilise bottles separately now.