Nice! That's a deal. Was it a sale or from another source like FB Marketplace?
Can't speak to the calipers but I had the PowerStop Z36 kit (pads & rotors only) on my '07 Sport for several years and they were great. One disadvantage is that few if any shops will turn drilled & slotted rotors but I think most people put new ones on anyway. I didn't have any complaints as some do about mud buildup b/c of the drilled/slotted configuration despite going offroad numerous times.
To your question, I went back to an all OEM setup a while back b/c I was able to get all the parts from Toyota at the same cost as the PowerStop kit. My personal opinion is that the OEM setup is as good or better than the Z36 in terms of performance, but I wouldn't hesitate to go back to the Z36 if that's more cost-effective than OEM when I next replace the components. Definitely interested in picking up some sweet calipers like [MENTION=148873]theladyviola[/MENTION] if I find a deal like she got.