So i did a quick statistical analyses comparing the Engine Prime bpm and beatgrid detection vs RBDJ, SDJ Pro & Traktor Pro. I don’t have Virtual DJ 8.
Sample size 20 Tracks all sorts and i kept it at “mainstream” genres.
BPM Range 60 to 160
Bias: One or Two old tracks probably made with live drummers, i initially planned on just using modern tracks but i thought what the heck.
Results here
BPM GRID.xlsx (9.5 KB)
My spreadsheet skills are not that great, so all the bars are blue 
G = Grid B = BPM
I accepted half time bpms as a correct bpm reading