I remember reading some of Balliett's early stuff years ago and being startled at a reference or two to Rollins's "ugly, billy-goat tone" or words to that effect. I had never thought of Rollins that way, but had to admit that I didn't listen to his "tone" per se, but rather to his "line"---what he was doing musically. If you compared his tone to prettier sax players, then yes, I supposed it was rather flat in comparison (though I prefered to think of it then, and now, as "emphatic"---certainly not ugly.) But you don't listen to Rollins for tone; particularly for a fat, burnished, singing tone. This was a criticism he made several times, it obviously got on his nerves, but it strikes me as like castigating Dizzy for not having the golden tone of a Clifford Brown. Anyway, I dismissed it, because these were particularly old Balliett essays and he may have changed his mind in the ensuing three decades or so.