It's user friendly, not overly complicated but does exactly what I need it for without much fussing or faffiness! The best part of this system so far has been that there are other people who have used similar systems before me & helped educate myself further as well - which saved my time over having go through each step by hand (which would be tedious!). There isn't any one feature specifically however we do sometimes struggle with how quickly our emails come back when using multiple email addresses within different accounts / clients etc.. This may also just relate more towards us being new users compared too seasoned ones? We haven’t really found anything specific yet though if you know where your issue lies they will help out here very easily!!