Time and time again VGChartz have been actually overtracking the XBox 360 and the 360 sales been adjusted down proves the 360 was overtracked. VGC have also undertracked PS3 sales which get adjusted up to correct them closer to actual PS3 sales. The shipment numbers should be close to or match the retail sales numbers after 2 months.
I am not sure about the Wii and DS but they could be slightly undertracked or overtracked as well. I believe PSP numbers could overtracked by VGChartz due to discrepancies between shipment and sales numbers. PSP had shipped over 50 million units according to the March 31 shipment reports.
Anyway VGChartz provides a good service by providing free sales numbers to the general public for consoles and software. The hardware sales are within 2 to 3% of the actual numbers and the software numbers are within 10% from the actual game sales.
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