Obviously, it can help you in tourneys, give some information, too, but you have to collect hands for at least 3-6 months and you still won't have enough about more than half of the opponents, but it can be useful, not so often like in CG or SNG, however by the time it shows relevant stats about tourney players, too. Depending on HUD stats in tourneys, like on CG/SNG probably won't happen, at least in my case.
In tourneys, the biggest problem, when you sat with opponents in FT bubble, or any short handed situation for a long while, maybe not even once, maybe he was the chipleader and stole with everything, and later on you face with the same opponent, the stat shows something very weak, and you have enough hands about the player, you do not remember what situation the previous hands collected, so it is like a trap, and you can run in it easily. Also the opposit, some weak player was waiting for get the FT, and he folded everything, later on you will think based on HUD, he plays tight, meantime definitely not... At least, similar things happened with me, when I had a HUD on tourneys and I gave more attention to the stats, than I would had to...