The wrap held up great. No peeling etc. whatsoever.
If I had it to do all over again I would swap as many pieces as I could from a standard Yukon and just wrap the window trim and the grill bezel. With all the wrap you're pretty much limited to always hand washing the vehicle. Which is my practice anyway but I would liked to have had the option of using an auto/touchless car wash if needed.
I sent the grill insert out for paint. What you see in my pic is the actual OEM grill. I was told the grill was etched/sanded, primed, painted, and cleared. The truck was purchased brand new, blacked out at 275 miles, and I traded it last month with 4958 miles on the odometer so I can't speak to LONG, long term durability but I never saw any issues with the paint work. Not sure where you are located but shoot me a PM and I'll give you the name/number of the shop that did the paint work. They may be able to help.
I will say the job was not cheap and there were times when I wished I could roll back.
On the subject of the door handles. The door handles came with a black "face" and chrome bezel. I never touched them because they seemed like they'd be a PITA to remove and reinstall. Plus I knew my GMC logo was going to maintain the silver/chrome outline so I left the door handles alone for symmetry.
For what its worth... There is another member here with a Yukon SLT that is completely blacked out. I think his name is "Modded". Not sure how active he is but I'm sure most of the old heads around here know him. He was super helpful to me when I asked him a bunch of questions about his truck. Maybe look him up for some additional insight.