I can't comment much on the tru-flight throwers from CS as I have never even seen one. While I am not typically a big fan of stainless in most knife applications or of United Cutlery, I have a set of the old Hibben designed large throwers from United, they are supposed to be in 420 J2, at least the new ones are. At any rate, I have had these things since the beginning of time, like the early late 80's early 90's they have seen a tremendous amount of use and abuse, the edges are nicked and dinged all to hell they have been thrown into sawn butts, plywood, trees, telephone poles, scrap sheet metal, and once a defunct Kerosun heater (I highly dis-commend this practice), they have impacted rocks, concrete blacktop and other knives but the tips are still in great shape.
With regards to your target, I agree with the others, don't throw at plywood, but for a different readon, that being that it's bouncy. Sooner or later you are going to start throwing harder and trying fancy crap like point blank throws. At which point the knife is going to take a bad bounce and come back and stick in your arm if you are lucky or your neck or eye if you aren't. Then you have to bandage it yourself, because your wife can't help because she's a big weenie and doesn't like the sight of blood, and she's laughing too hard to be of any help anyway. Then you have to drive yourself to the ER, because your wife is still laughing, and if she takes you she's totally going to rat you out on the nature of the wound. Then you have to think of an appropriate lie to tell the ER staff to explain the self inflicted stab wound on your arm. If you tell them the truth you are going to feel like a jackass, they are going to call the cops because there's almost always a reporting requirement for knife and gun shot wounds, then you are going to have to explain it to the cops, and you are going to feel like a jackass all over again, and it's probably going to wind up in the paper, and everyone, ER staff and cops, are going to be laughing at you if they believe you, if the cops don't believe you they are going to go ask your wife all sorts of questions and insinuate that she stabbed you, because a knife wound to the forearm is a classic defensive wound, which is going to make her SUPER happy, and YOU WILL NEVER HEAR THE END OF IT.
So, don't throw at plywood...
MDH