Subscribing for your results. I've read a bunch on the e39 forums regarding the retrofit and I always reach the same conclusion. ~$2000 for a buggy version of an OE system does not compute. I keep holding out until they work out all the bugs and kinks as I don't mind the price premium so much as I do not having things work 100% after dropping all that coin.

So far, my best experience was an Avin Avant 2 in the E53 and that also had compromises and issues.

Wishing you the best of luck and I've got my fingers crossed for you as I'd love to do this to retain OBC functionality as well as playing well with the DSP equipment.

__________________
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)