I had my 34's front discs machined and Bendix Ultimates put on about 3 weeks ago. Mine are also squealing. I took it back to the mechanic who fitted them and they machined the "glaze" off the pads, but 2 days later, they were squealing again. The mechanic suggested that i do hard braking to try to wear them in better, however it's not like i can in peak hour traffic every day. And not to mention the amount of brake dust coming off them is terrible!
I'll be changing the pads to a different (more expensive) brand when my next service is due. I really can't stand the squealing.
I've been recommended EBC or Endless to try...