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Depends on your use/goals for the car.
OEM Enthusiast - If you want it to stay OEM/BMW only get the M3 bushes and pay the extra for install or DIY if you have the skills.
Daily Driver/light AutoX use - I DD mine so ride comfort was important. I did the inserts b/c it was relatively easy but if I did it again I'd get the 2-piece replacements RSFB (like the Whiteline KDT917 Subframe Mount Bushings).
Track Car (choosing performance over comfort) - the all aluminum version will have the least play in the system. You'll gain performance, give up a bit of ride comfort due to the solid nature of the mounts.
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2011 135i w/ DCT | ZSP Sport Pkg | PPK | Ohlins R
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