Rated 4 out of 5 stars

Excellent add-on for sending customized emails to many people at once. However it would be great if it would allow nested variables. For example,

Pluralizing numbers:
{{NumProducts|==|1|1 product|{{NumProducts}} products}}, which would use the text "1 product" if "NumProducts" is 1, or else it would display "{{NumProducts}} products" if it is not 1.

Either one variable or another variable:
{{Name||{{Company}}|{{Name}}}} which would use the text of "Company" if "Name" is empty, or else use the text of "Name"

URL containing string:
{{PromoCode|||Click on http://www.example.com/promo/{{PromoCode}} for a {{PromoDiscount}}% discount off your next purchase}} which would add this text if the "PromoCode" is not empty.

This review is for a previous version of the add-on (4.11.0).