NAT Routing / Offload: Has anyone tested on AR750 / S?

Hello!

Firmware 3.203-0701
Luci>Network>Firewall>NAT Routing / Offload

1.Has anyone tried the Routing / NAT offload on these routers?
2.Is there an improvement only in the Software Offload option?
3.Can the hardware option can be used with QCA9531 / QCA9563?

Thanks