Didn't use one first time through for TR1. Used one for TR2. Used one for TR3 (really, is it possibly to not use one?!!! Other posts say otherwise
). Used one for TR4. Didn't use one for TR5. Only used one for half of TR6. Didn't use one first time round for Legend.
I don't like using walkthroughs unless I really have to, especially first time through a game as it spoils it completely
Other than that, I am a complete walkthrough whore!!!