Something we have with our current NPS tool, and what prevents us from moving over to Smileback is the way that NPS only has the option to email all customers at once. What we have and prefer, is the ability to spread out delivery of NPS surveys evenly over time, so we have filters in place which brings our contact count down to 5000 contacts, but then we need the ability so spread out the delivery of the NPS email across the 3 month period so that say 100 emails go out per day randomly amongst all customers. This allows us to get constant feedback over a 3 month period, rather than mass emailing all customers in one day and getting hammered with responses back in one day. This ability means the NPS is constantly moving over the 3 month meaning we have a live pulse on how customers are feeling. If smileback had this feature then we would move NPS across.