Nothing really that I dislike about this product! It is very easy for my office staff who are not computer savvy or techy people at all; they can manage their own mass email campaigns through our system without any issues whatsoever!! We have been using it since 2004 when we first started working together - so almost 10 years now. Honestly though? Just keep up-to date because there will be new features added over those ten year timespan which make things easier/better if used correctly in combination of other products like ours etc..