Pures are more than worthwhile in f2p, as the added defense doesn;t really add much, considering that the best armour is rune. But above 70, they are kinda useless. I take most pures out, with 50 def & 60 str and att. The fact is, once you get into p2p, there is much better armour, and they find it very hard to hit through, whilst the better weaponry in p2p shreds their defense. So in my opinion, low level pures are good, high level ones are completley worthless.