First, if that unit is for RNS-C and RNS-D it will display little if anything due to limitations of the RNS. The best it can do (like XcarLink) is a track number.
(and presumably there's some cabling too - not illustrated)
Second, I've got Bluetooth on my XcarLink and it works well both for music and phone. Usual limitations on phone reception if the handset is inside the car with no external aerial, but for "occasional/emergency" use (which is all I really need) it's easier than a fully-fitted car kit.
I ran the microphone lead up to near the sunroof switches; it's not the best but "adequate".
My main phone is an older Nokia (not a smartphone) and pairs fine. I have (for work use, not when driving the S8) an iPhone and out of interest tried that, it was quite iffy about pairing up properly, but I also have WiFi problems (losing networks) with it so maybe it's on the way out..... 
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant.
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
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