One thing for you to consider: Software RAID is no longer a dirty word and somewhat suspicious.

As current processors have a lot of power available, it becomes unnecessary to have a controller and a specialized processor. You can find good and solid RAID systems in free software, much more tested than a controller from... a beginner manufacturer.

More flexible configurations, more maintenance and recovery tools, more sophisticated security, better logs and, especially, great integration into virtualization platforms like Vmware and Proxmox.