Oil Separator invoice - reasonability check

[vegasX5]

I'm in the same boat as many here where my X5 4.4i needs the oil separator replaced. It's been leaking oil pretty consistently the last couple of months, and it's definitely coming from the separator and associated hoses which are very mushy.

I've called a few places to get estimates, and they range pretty dramatically. This place seems to have the most experienced techs, but their prices seem to reflect it. They're quoting $453 in parts and $589 in labor. I've heard quoted prices for less reputable shops as low as $500 all in parts and labor. He said he's recently done one on a 4.4i and attached the invoice/estimate for me to review. I attached it to see if anything looks peculiar to you guys. I would love to do it myself and had planned on doing it for months, but I just don't have the free time necessary right now to do it. I also have a 400 mile road trip coming up and need it fixed before the trip. Let me know if this sounds like a "decent" price or if I should look elsewhere (even the dealer). As always, thanks!