I disagree with the bold... VGC most times is far way from the reality but I agree with yout others points
Adjustments less than 100k after the trackers numbers is fine but we see more ~600k, ~400k, etc adjustments here that makes the numbers not even close to the reality.
okay I meant quite near relative. Quite near if you compare VG-chartz estimations with other ones who estimate console sales every now and than. Take the predictions of last month as example, VG-chartz was really quite near the NPD numbers with Xbox one and Xbox 360 predictions and than take a look at how far off michael pachter was with everthing. VG-chartz was quite close with Xbox One, Xbox 360 predictions, they overestimate the WiiU and PS4 just a little bit and they only overestimated the 3DS quite a lot. Pachter was really with everthing so far off, so I think VG is most of the time quite near and the best thing everytime when they are wrong they adjust their numbers when official numbers arrive.