You will be hard pressed to find cons. We recently stopped offering SRM and Veeam replication and went 100% Zerto. Also switched 5 existing SRM customers to Zerto as well. (Data center to data center replication)
Good stuff. Ping me if you need more info. I wish they would offer some sort of (low cost) backup product because snapshot based backups are painful.
-Tom
Bit Refinery