Spend the extra money. I often pop on the Surround View to confirm where a curb is, where parking lot lines are and a possible wayward tree that seems closer than it is.
I use the Side view cameras for exiting blind areas and use the Active Blind Spot as a reinforcement of where vehicles are beside me.
If you do a lot of slow city driving the Active Blind Spot has a low threshold speed of 30 mph/50kph so it is NOT useful at very slow speeds.
As others have noted, you only need to save yourself one curb rash or dent to justify the cost.
I'd get them again.
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2018 640ix GT; Alpine White, Blk Nappa, Piano; M-sport, Premium (Ceramic, SIRIUS, Soft-close, Vent/Massage Comfort seats, Surround, Sunshades, Parking Ass't), Advanced Driver Ass't (Lane keep, Steering/Lane control, Cross traffic, ACC with Stop/Go), Smartphone, Tint.
Retired: 78 300D, 81 300SD, 87 190E, 88 Porsche 924, 89 260E, 93 300E, 97 Volvo 850, 98 E320, 03 BMW 325iT, 02 C230 Sport Coupe, 08 BMW 535i, 12 BMW 535i X-drive
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