The ability to create letters that are personalized for each recipient is very nice. I love how it lets me do things like make sure my sales team knows about an event before we've even sent out invites! It's not as easy/quick at sending emails but its still convenient since you can use web push notifications instead of having them wait by their phone when they get home from work (which could be anywhere). Its also great if your organization doesn't have enough people to write hand written thank-you notes. There aren't many companies in this space so everyone should try one :) We're trying to send more handwritten thank-yous because it makes us look better than other businesses who don't go above & beyond what most customers expect nowadays.