I had some first year BT's and I thought they did too much damage under certain circumstances. I suppose lung shots would have been perfect with the bullet. I stopped using the BT when I hit a shoulder. Honestly, I do not recall the caliber or the cartridge - but maybe the 30-06? I have no qualms about using the BT's now.
As far as bullet performance goes, I prefer bullets that stay together and don't destroy a lot of meat (blood shot) when the bullet hit a shoulder. I will (and often have) shoot at running deer and sometimes the bullet doesn't hit just behind the shoulders.
