I just recently got Torn Asunder and I love it.
The crits, called shots, healing and ac/damage rules are all nice and not too complex, easy to insert into most any GM's campaign with no effort or minimal effort at most.
I had been using a homebrew armor system to represent armor wearing out, requiring the players to keep their armor repaired and in good shape, as the armor would get hacked n bashed up.Then when T20 came out I kludged it togather with their ac/damage system.
But now I am going to scrap it and use the Torn Asunder rules as the baseline and build off its crit/called shot rules for armor getting beat up. Should vastly streamline rather good after the kludged system I have been using.
Next on my to buy list is their arms & armor book, should be well worth the money if it compares to Torn Asunder.