It does exactly what you'd expect it to, and works very well. Mine is running on a TrueNAS VM in Proxmox using IOMMU. Make sure your VM is set to UEFI mode, if it's set to BIOS you will get a bunch of errors and won't be able to use the HBA. Even though Broadcom doesn't state it's compatible, you can use this with SlimSAS to 8x Sata cables to run Sata HDDs directly.
10/10, would buy again