This looks fantastic. Remind me again: what animal are you hunting? I like how if the foot trap doesn't catch it, there's still a shot it'd get tangled up in the spider web!
You don't need "time" to tell you how this will hold up. It won't.
Come on. Personally, I would have rejected that work. I can virtually guarantee the fill line is going to get kicked and broken. And it won't break on the outflow side, nope, it's pull out on whatever side will get you the most soaked on a cold fall night, in the dark, on the wrong side of the shut-off valve, of course. Or it'll be the wiring. It'll be a race to see which gets yanked apart first. And the wires on the wall should be supported, and protected from UV. I would have used conduit, which he clearly knows how to do (or did someone else wire your lights?). Better still, those two devices should be in some sort of weather-resistant box, nice and neat, with conduit between the box and where the wires have to end up. A box like the Pro-Trade box or similar. He's got quite a menagerie going on over there under the automation controller, too. It's sub-standard work, IMO, and not professional, at all.
A pad can be a pretty harsh environment: wind, water under pressure, rain, chlorine, acid, dust, dirt, sand, rocks, kids, animals (like Pex-chewing squirrels), pool toys and maybe throw in a "helper" with a beer or two under his belt. Ya gotta make 'em a little "Murphy's Law" proof. Hide wires from the sun, make them trip proof. Look for trip and step hazards, especially smaller pipe and device that aren't as strong as the other stuff. Tuck them under or behind heavier duty elements for protection. Stuff like that. For example, that fill line should have been on the house side of that pipe, not stretched across a walkway. If that's where the source happened to come up, then bury a line from it, under the pipe, and pop it up on the other side. Is Pex even UV rated?
Please pardon my ol' crotchetiness. If you like all that, then never mind. Otherwise, have him straighten it out, or do so yourself. I try to use the 30-year rule when assembling things of this nature. As in: will this hold up for 30 years of abuse as is? Adjust the 30 to suit. I use thirty 'cause I won't be a pool owner after that, one way or another.