Buying a prime 4 is a no brainier. For what it does, it’s surprisingly cheap, (cheap enough for a €10 wristwatch to be afforded ;-)).
Engine Prime and the Engine algorithm inside the Prime range gives the right BPM for about 90 percent of tracks, unless you still like Drum n bass, in which case it’s right about 10% of the time. The beat grid and first up/down beat detection is off too, partly because of the bpm detection being off but partly cause of varying bpms like old 70s human drummers and help-a-mix transition tracks.
Denon DJ have told us, for over three years, that they’re working on it, and have told us for over three years that it’s “soon” and have told us in the last few months that it’s just “around the corner”. I wonder when “around the corner” turns into “it’s really so close” and which year all of those phrases turn into decent firmware inside our units.
But even in its “close to right bpm” state of firmware, the prime 4 is probably the best play back solution out there now, ditch the laptop