I'm hunting with them now. I think they'll be fine, but I haven't shot anything with them yet. I'm using Lightspeed 500's 26.25" long out of a 60 lb. setup.
Using Lightspeed 400 26.5" @67lbs with G5 strikers and no problems. Blew through a small 6point buck two weeks ago and arrow was stuck 20yard from impact still in perfect shape.
Very few arrows are going to be as strong as the Axis 'N Fused. But I would not hesitate to use the Lightspeed for small to medium sized game. Particularly speed goats.