For tournament (SNG and MTT) only players like myself poker tracker is of less use than for ring game players. I have purcahased it and it does save the hassle of keeping a spreadsheet but :-

1 It does not autorate players using tournament hand historys(dont know why) Even if it did it would be of limited use as playing tournaments you dont tend to meet the same players often. I have about 23000 hands over 405 tournaments . I have hand historys of over 3000 other players but only 12 of which I have come up against 3 times or more. Even then the most hands I have for any other player is 31 which is barely enough to base an opinion on.

2 The info on ones own play is also of less use. For example PFR in early levels is often pointless in anything under a $100 SNG therefore your aggression rating may look low. Also (hopefully) if you reach the end of a lot of SNG's you will have to loosen up therefore your stats of seeing the flop will probably be on the high side compared with ring players.

If you are not on a budget though I would still buy PT just for the ease of keeping track of your results although some info from MTT's still has to be manually entered.