We use amocrm and decided to integrate it with WhatsApp. The setup was quite simple, and we hardly needed any assistance. I can't say anything definitive about the results of the service yet, but I've noticed that communicating with clients through WhatsApp has become much more convenient. I also want to highlight the affordable price of the service. It would be great if i2crm added integration with Telegram, as we are currently receiving a lot of orders from there.