I have used reachdynamic for over 10 years now, it has been very reliable in reaching our target audience with high quality email campaigns that are not spammy or annoying to my recipients! The service is always affordable when you need more than one campaign at once too (or if there's any issue). No complaints here!! It does what we want - helps us get results without having much effort put into sending emails out ourselves as well since they do all of this work behind-the scenes. We've seen great success from using them so far but only because their team really works hard day after working doing everything possible within reason :) They're also constantly adding new features which help keep things fresh even though most people know exactly how these systems operate by already haha :P My favorite part about being able to use such an effective marketing tool like theirs? That everyone can benefit regardless whether your budget allows.