Electronic Assist Braking System?

[MyBenzMax]

Would appreciate commnets on wheter it's advisable to avoid used 2004/5/6 E Class's due to the electronic brake assist. Apparently MB has abandoned this setup due to numerous customer complaints. Was wondering if this is just overhyped or worth avoiding. My friend has a pristine 2004 E Class, 4k miles, may be selling it. Is it worth considering or not?

Thanks...