I too shoot a bow that has a 70 lb pull, as I too am a big guy (6'3" 270). That is the bow that I have shot for years. I am not, as I said, condemming mechs. I have had some success with Rockets, and I too have a couple friends that use them, thats how I found out about them.I alsohave a couple friends that quit using mechs. for the same reason I stated in my earlier post. All the people I mentioned in this post are highly experienced, avid bowhunters, all with 15 years exp. or more. I guess that further proves what I wrote earlier, we all have to use what we are most successful with and also have condfidence in.