The best thing about this service is that it's cheap, simple to use - you can send mass emails or targeted ones very easily with your own custom design templates! It also has great customer support who are always helpful in solving problems as they arise (including those pesky bugs!). I dislike how easy spam filters sometimes become too strict at times; however these issues don't seem enough of an issue for me not worth mentioning just yet though perhaps if there were more options available then maybe we could have some better filtering capabilities? Just be patient when using their services because once again like most other companies out here nowadays even well known brands will get spammed by bots so patience really does pay off eventually ;) Make sure you're sending from verified accounts only otherwise its likely someone else/bot might end up being blamed instead haha :). Sending bulk email campaigns daily without any hassle whatsoever which makes life easier all around especially during busy seasons such as Christmas etc :).