Not even worth 1 star. Let me explain why it is not worth even 1 star. To be fair with the developer. I will start with positive thing first.

pro
1. it interacts with visitors and get their emails. And that was my only subject to install this app. I have tested with this app and other apps. and it seems it works a bit better than other apps.

2. unlike other apps, visitors who interact whit this app tend to make purchase a bit high rate. (based on coupon code, created only for this app usage. )

Now here is the main reason why this app is not worth even 1 star

1. recently I have discovered that my front page url has been altered. In the session page, three were 2 different store front urls. One is of course my store url but the other one is not. I don't have any sub domain or anything so I didn't understand why I have 2 different urls on my store front page.
Therefore, I spoke with Shopify support team and they found out that this app injected code into my store page and altered the url. The altered url that appears to Chinese domain, (naoxiangxiong.cn) which I never heard of so and there is no search result in google or bing so I clicked on it.
for few times, it directs me to my store front page but other times it goes other store pages.
This is totally unacceptable.

2. Once I discovered this, I checked google analytics and other tools that I use to find out if there is any weird traffic comes to my store.
Unsurprisingly, there was junk bot traffic came in to my store and all of them visited wait for it !! naioxiangxiong.cn !!

altered url, fake traffic, for that reasons it is not worth 1 star

sembra davvero efficace. Ma se qualche utente inserisce una mail falsa, il codice viene rilasciato comunque. Però sembra avere effetto sulle persone

I just downloaded this app and I hope it works well I will use this app to drive more sales if possible.