am36, don't worry, I'm one of the few of us on here with a manual X3 and I can confirm that my car has hill start assist. I actually find the electronic handbrake quite good in that you can feel when it's going to release (it's a split second after you release the button) so it's not really an issue. If however, you're holding the car on the foot brake, the HSA will hold the car for a few seconds after you take your foot of the pedal - just enough time to get on the throttle and get the car moving.
I had a 2009 previous generation X3 before this one, and the HSA worked in exactly the same way.
My car's a 2013 model year 20d M Sport (built in September) so I'd guess it's pretty much identical to yours.
Hope ths helps, and feel free to ask if you have any more questions.
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2017 Porsche 911 Carrera GTS and 2019 BMW X3M Competition
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