I started Stronglifts 5x5 in September so tomorrow will be my last workout in the first 12-week session - not a lot of experience but happy to share!
I'd been doing Body Pump for a looong time before that so was used to the exercises and form; when I switched over to 5x5 I started on slightly lighter weights than I'd been using in Pump, and complained to my husband that it felt too easy - with the 5lb adds that didn't last long! I've had a few stalls along the way where I had to deload slightly for a couple of sessions to build up strength before starting to add again; I've also had days where I've managed my first set with the 5lb increase, then had to drop it back down to finish the rest.
My husband has definitely managed the increases in weight without as much trouble as me; depending on the exercise he lifts 45-100lbs more than I do, and the 45lb difference on squats is only so small because he's had lower back problems in the past. Unlike me he has done similar programs before, so started on heigher weights to begin with and hasn't really struggled or stalled like I have.
It is a taxing workout, but I like that. I don't mind feeling the aches in my muscles later in the day (totally different to DOMS from Pump), it just reminds that I've worked hard. I do think it would be very tough to do alone though - I certainly wouldn't have seen as much progression without a buddy/spotter to push me and give me the confidence to try a weight knowing I won't drop it on my head if I fail! I've also found it helpful having a back support for squats, and lifting straps for rows and deadlifts.
Don't have my progress sheet to hand so can't give numbers, but I am now squatting and deadlifting more than my own bodyweight, and am going to try my first set of unassisted pull-ups tomorrow (not a 5x5 exercise, just something I wanted to achieve). I've seen far more gains in terms of strength increase/body fat reduction in 12 weeks of 5x5 than I did in years of Pump.