Anybody else extremely annoyed by these? The cam system on some of the older models is godawful. 100% resistance in the most stretched position going to 50% in the contracted. For instance, I was doing leg extension, which I do explosively (I do all positives explosively). After I overcame the initial struggle, I kicked the weight stack up and it made a huge clanging sound. Same with the ab machine. I'm scared to try the others.