I started on 5/3/1in march and love it, after 5 months from no weight training of any serious nature,
Learning squat, military and dead lifts from scratch using ripptoes techniques, and lost 10kg weight, factor in adding muscle mass, that's a fair bit of fat.
BP 1.69
DL 2.46
MP 1.05
SQ 1.97
I'd recommend 5/3/1 to anyone that wants to progress easily. I was stuck at 1.08 on bench before starting also.