The UI helps us keep up our inventory levels for multiple outlets at once! It's easy enough that I can use it without training even though we have only been using them since June 2018 (and they've had over 4 years development!).
They could improve their support staff - there were times when one person was unavailable while another couldn't answer questions quickly/correctly about how things work within software like ours & theirs. We're able help manage large amounts data efficiently so sales teams don’t get bogged down managing orders from different stores as well which saves time during busy seasons such summer months etc..