Well what we kno, WiiU might be overtracked by some (pls god no)
X1 is definitely overtracked, but probably by just 10k-30k
Vita is beyond overtracked (jkjkjkjkjk), its undertracked and by alot (vgc=11k). Lots of people kno this due to BL2. BL2 has done 59k last month but i strongly doubt vita sold tht high. My guess is between 35k-45k sold