My Net N900 Does not deliver advertised speeds

I have not been able to coax any speeds out of this router greater than 300Mbps with the laptop sitting 2 feet from the router.  Level 2 support was no help.  I was hoping for greater throughput.   It seems I bought a 450+450 router but am getting only 300+300 speeds.

Is anyone out there getting better results?

Is your laptop capable of it? Your wifi adapter in your laptop must be capable of multistream / wide channel 802.11n