I like that this integrates with our website very well so we can easily set up what type of message needs to be sent out, when it should go out etc. It's also free unlike others which cost money if you don't have enough sales in order for them to make sense financially (which ours doesn't). There are some times where there isn't much feedback from users but then again I think that could just come down more to an issue between clients being able to fully understand how they're going about things or not knowing what their end goal might look like - perhaps training? As long as people know exactly why they need this extension installed/activated, most problems will solve itself once activated. The biggest problem would probably still likely be getting new customers through channels other than search engine results since those tend to take time after someone has.