OfaC

I must say this was the easiest Poe crossing ever!!! We pulled up to the peace bridge with a 20 foot uhaul only one car in front of us. We handed our passport and the man at the window was like ok so one American and one immigrating with a giant smile. Told us I just need a stamp and the pull into any parking spot and head into door 2. We got inside and was called up to the window and was only now asked my new address. They took my photo and finger prints and said I was good to go. We made a really nice list and no one checked it and didn’t even check my uhaul... now the hard part was I had my hammy and reptiles with me so I kinda made them take the paper work for that. Sadly the fws wasn’t in so it took about 10 mins for them to sort out that. If you are bringing over any exotic pets make sure to just double check what all you need bc in some cases you may need a permit to import them. It still doesn’t feel real yet  feel like I need to head back to Canada in a week like normal. Ps kinda sad they didn’t even look at my importing paper work we work so hard to do lol but I think he saw the giant folder and as like yeah they filled it out lol.

From a US Gov/Employment perspective, you're absolutely fine with an endorsed IV. I've never had to go into secondary when re-entering with the endorsed IV, no holdups either. CBP sometimes get curious about my LPR status with off hand remarks ("Oh you're a CR-1...good for you", and questions about who petitioned me etc). I still have my Canadian PR status, and I've not had issues with either country, except for the CBSA thinking that I'm entering as a visitor until I show them my Canadian PR card.
 
I have, however, had issues with my bank wanting proof of my LPR status and they explicitly won't accept my endorsed IV (yes, I argued with them till I was blue in the face, they would not do it), they wanted the physical GC. This was Chase btw. They did take my SSN and my accounts are working properly, I've no idea what they needed the GC for.
 
The other potential snag is trying to set up a mortgage, again, Caliber Home Loans seem to want a physical GC but I'm hoping they'll accept the endorsed IV.
 
I've also had issues with WA DOL who initially didn't want to accept my endorsed IV, but I was able to argue it with them and they eventually did. Because DoL appts are so backed up, I had to drive 6 hours out to Moses Lake so I don't think they get many immigrants there.

The only issue I ran into without the GC (it took 180 days) was the local SSA has no clue that a MRIV equates to a GC, despite what the federal site says.  I needed SSN's for my kids for tax purposes and it was a cluster to try and get them.  
 
Overseas travel shouldn't be impacted as long as your validation stamp is good.