I've been using this for over a little than 2 months.

Summary: not worth it, go for an established cold email software

Pros:
1. warmup really good no problems

Cons
1. Speed to lead is virtually impossible (because notifications are not instant, it says refreshes every 15 minutes, but i've gotten notifications the next day)
2. All replies do not show up in the unibox (which means the campaign still continues sending out, even when the lead replied, and I look like a idiot)
3. Support also nonexistant
4. Doesn't support "unusual" languages in the unibox, for example If I receieve a reply "Jā man interesē" What I would see is "J man interes" same goes for other languages.
5. Their inbuilt automation software also not good and doesn't support obvious features (For example you want to recieve a notification to slack what lead replied with the reply message, that's not possible, just recieve the sender email and some other stuff except the reply.)