I had been doing SL5x5 for quite awhile and although I like it, I was ready for a change. I started 5/3/1 and just finished my third week this morning. After lifting 5 reps on every exercise for the last 18 months, it did feel a little different to try and shoot for more, but the more I go for the AMRAP on the last set, the more I'm enjoying it. So far I've been able to beat the calculated 1RM on every lift, every time, but I'm planning on that changing some as the weights keep going up. So far here are my rep maxes:
Military Press: 115x9
Deadlift: 310x8
Squat: 240x10
Bench: 195x9
Calculated 1RM

I'm pretty sure that my actual squat and DL are higher than those, but I've been thrilled with my bench numbers! This morning was the bench workout and I looked at the number of reps needed and in the back of my head, I really didn't think I'd be able to hit it, but sure enough...I might have actually had 1 more in me, but it would have been close and I didn't have a spotter, so I was just happy with increasing it 1 rep instead of 2

I'm also doing this while on a deficit and doing some kind of cardio an additional 4-5 hours a week. Right now around mid 180's trying to get down to low 170's again.
Deload week will work out perfect falling on thanksgiving week.