The customer service team at Stamp are always willing to help you with any issues that arise, so if there's an issue they're very quick in responding! I haven't found anything yet but it could be because we've only been using Stamps for just over one year now - however from our experience everything has gone smoothly without too many problems or complaints etc- as far of my knowledge anyway :) We have reduced employee churn by around 5%, which was great when considering how much time this staff spend trying get people back into their systems after being off sick/on holiday /etc.