What went well: price was right. I didn't have to do any prep work - they did everything which made it very easy for me. Work was performed very quickly - just 1 day after Salvador came to look at the site. Also, the finished concrete slab looks nice & matches the existing slab exactly (as far as I can tell - only poured today & still drying).
What could be better: instead of moving sprinkler heads as specified, they poured concrete over the top of existing sprinkler lines. Not a big deal, I'll cut the lines & repipe in the spring to avoid future problems, won't take me long or cost much (I can do myself). Also, the crew nearly "forgot" to drill & insert rebar to tie new concrete to the existing slab. I had to run out and remind them, while the concrete was being poured into the form! I would have been upset had there been no rebar.
Overall, I am pretty happy with the work that was done, given the price I paid. I would recommend others hire Salvador & his crew to pour concrete - but watch closely to make sure they are doing the work as you specified.