I have only driven a 545 with it, and only for a day or so. I found it unnatural. Having said that, if it was the only vehicle I drove I am sure that within a few days I would be accustomed to it. I would worry if I drove multiple vehicles and only one had it installed.

Is it necessary? Not in my opinion. I have read of some posters who love it, so it is likely one of those personal options that drivers like or don't like, not many will be neutral on it. I wouldn't spend the money myself.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue