I would NOT use anything as critical as brake-related parts from an ebay vendor that carries unknown product name/lines.

Akebono, Hawk, EBC, Satisfied, etc some examples of reputable names. OEM BMW are some of the best, if not the best, performing pads but at the sacrifice of dust.

For rotors, my recommendation would be OEM or Brembo factory replacement. Other options can be found and a good site to gauge decent- or better-quality parts is Tirerack.com