ive only had to deal with Daphne and Joseph, but both of them are so nice! Daphne was especially helpful in helping me pick the right b bag for myself. And she's cute to boot! I've heard a lot of good things about Sarah as well.
It seems Bal NY in general just has excellent customer service, it felt so much nicer buying my bbag at balny than it ever did at Barneys, the SAs at balny are simply wonderful!