$1800, about $1360USD, is a lot I agree (that's CND not USD I assume). But don't downplay their "overhead, experience, training, and etc." If a mechanic can do a 20 hour job in 10 hours because of his skill, he has earned the right to get paid for 20 hours.

You did the right thing DIY'ing, and DIY is the only way I would own a BMW(s). Book times and msrp parts prices on these things are expensive. Don't blame shops for making a living, you have a choice to choose another shop. It's like getting multiple quotes on a remodel. You have the choice to pay or choose another option.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)