I like how simple it is to create customized campaigns that target specific audiences and have those campaigns tracked so you can understand which ones resonated best with your customers. It's hard to see all the data in one place. Would be great if there was a way to export everything into Excel or something similar so you can do your own analysis and trend out any issues you may spot. I also don't like the fact that you can only do one category at a time when creating a campaign. This makes it harder if you're trying to build a large list but still want to send personalized emails. If you know how to use a computer you'll be able to figure it out quickly. Tracking and reporting on email opens/clicks has been very helpful in reaching my audience and growing my subscriber base.