I bought a pair of rebuilt rear ATE calipers from the Mercedes dealer in 2001. One caliper only lasted 3,500 miles before leaking. It was replaced at no charge. Since then I haven't bought a rebuilt caliper - I just rebuild them myself. I've also gone from Bendix to ATE with no problems.

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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)