Looking at my logs for 5/3/1.
I started the last week of February last year, so I'm at 11 months on 5/3/1 currently. I had been doing Starting Strength for about 10 months before that. I had been stalling for about a month, and my legs felt like they were turning into rocks.
My first 1s week on 5/3/1 (2/23/2015-2/27/2015):
OHP: 100x4
Squat: 270x3
Bench: 140x3
DL: 300x4
My current 1 rep records, 46 weeks later:
OHP: 165, +65 lbs
Squat: 365, +95 lbs
Bench: 260, +120 lbs
DL: 405, +105 lbs
(For bench, I had a shoulder impingement injury and had just gotten better, so I had been catching back up here, I had been at 205 pre-injury)
My impression of 5/3/1 is that it's slow progress. Are those good gains for 11 months of training? I don't know. Is there something faster? I don't know.
But considering I spent a month deloading trying to break a plateau on Starting Strength when you're supposed to be gaining every time you lift, I probably could have stalled forever on Starting Strength. Instead, I immediately busted through that plateau and steadily gained. 5/3/1 worked when something else didn't.
I'm 43 years old, and I have an hour of gym time. I had never done any strength training in my life until two years ago. I don't know if, at my age and in an hour a day, there's something I could have done to gain faster than 5/3/1. I just know that 11 months later, I'm significantly stronger and am satisfied that I can keep getting stronger month to month.