put quite untechnically, i dont like the fluffy grain and its contrast curve just isnt very nice. I probably never gave it enough time to get the right developer etc, but I always got better results with HP5+. Im not really a fan of any of the t-grain films, the grain in the older emulsions just gives the film a sharpness that you dont get with t-max or delta films.
That said, if grainless is your thing, 120 delta 100 at about ei 80 in perceptol 1:2 or 1:3 is as fine as you get these days, even in the old days, you needed something special like tech=pan to beat it imo