I used a mechanical once. I shot a buck at 6 yards with a 400 gr arrow going 265 fps. I hit it square in the middle of the ribs and did not get a pass through. I got the deer, but lost all confidence in them. Some mechanicals may be great, but I will never find out. My own personal experience has given me 100% success with fixed blade heads and what I consider poor performance by the one mechanical I used. Whether mechanicals are good or not, doesn't matter to me. From now on I'm using what has worked great for me in the past. Besides, I've never had trouble getting any fixed blade head to fly like they should.