This bar is exceptional.
Service of AB is very good, Mandy is kind and helpfull.
knurl is just perfect. It feels rather soft, then you forget about it during all your workout. Only after you realise how good it is, because it grips very well and it does not scratch your hands or your legs through your clothes (it does with more agressive knurl if technique is not on point).
The AB bearing system is another level, incredible. For exemple, compared to the Rogue Pyros bar, the AB sleeves are more tight on the shaft, rotation is smoother, more precision built. But it seems to reveal its true potential when the bar is loaded and in motion. The pull under feels easier : faster and smoother.
Very silent when dropped.
Overall, I would say I prefer AB over Rogue's bars (wich is a standard), I also tried the training bar in a gym and I prefer it over the Ohio bar (spins better and sleeves less noisy).
Only time will prove us if all of those bars will last.