How much control does the Asus N66U provide for QoS?

[goldenegg]

I currently have a Netgear WNDR4500 and am having nothing but problems with it. I'm considering replacing it with a Asus N66U and was wondering how much control it provides for QoS configuration.

- Is it strictly a low/medium/high priority setting like on the Netgear routers or can I specifically set minimum and maximum bandwidths for specific devices/applications?

- Can QoS be configured at the port level or must MAC addresses always be used to set rules?

- Can specific devices be granted priority over specific applications (i.e. devices A, B and C should only get priority for HTTP, while D and E should only have priority for SSH)?