I put my bikes on the roof (using OEM E70 rails and Thule Bars). I'm only 5'10and use a small step to put them up and can take them off without. I considered the lift but thought it didn't add much ay £250! As the car plus bikes is quite tall I also didn;t want the extra height this loaded gives over the bikes. You can't see it on the pic in this thread but it adds extra height. I think this attachment makes mounting easier but I find the normal way ok.

My 2p worth

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2008 E70 3.0D Msport
Titanium Silver, Nevada Black Leather, Brushed Aluminium Trim, Brushed Alu Window Surrounds, High Gloss Rails
20 Inch MSport Alloys, 3rd Row Seating, Heated Seats, Xenons, Media Pack, IPOD Adapter, Dimming+Folding Mirrors, Shine+Protect Pack