There's usually a blind spot - it just depends on your seating position where exactly it is. You can get an addon mini-mirror or you can get a wider rear mirror that gives you an excellent view on both sides. Of course if you have the premium package with the compass, then you've negated that feature... too bad cause I have gotten used to wide rear-view mirrors - they come in very handy. Anyway, you should always do a quick glance just before regardless.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr