I cant offer much beyond my own experience...I bought five bosch rebuilt injectors 2 or 3 years ago from mail order MBZ parts place. Before putting them in, I brought them to a reputable MBZ shop (Hatch & Sons, Wayland, Mass.) and had them checked for spray pattern and release pressure. They were all within spec, and have performed very well. The guys at Hatch and sons recommended that I check them...they said that they always do, and have had Bosch factory rebuilt injectors test way out of spec and need to be returned.

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)