However, this is far from suggesting that an indigent's request that a court assign new counsel is to be granted casually (People v Brabson, 9 N.Y.2d 173, cert den 369 U.S. 879; People v Yates, 45 A.D.2d 778). For, among other things, practical constraints on the administration of a program for providing legal assistance dictate that "as long as assigned counsel are men of ability and integrity, the discretion and responsibility for their selection rest with the court" (People v Brabson, supra, p 181; see, also, People v Jordan, 49 A.D.2d 660, 661). But this does not gainsay the fact that where "good cause" does exist a court is well advised to effect a change of counsel (e.g., United States v Burkeen, 355 F.2d 241, 245, cert den sub nom.