Ok well I'm shopping to replace my Mission UX2 and I think I have narrowed it down to the Z7X or Helim, I shot both side by side today and originally I was set on the Z7X and the guy at the shop said I might as well shoot the Helim while I was there. I was impressed with the Helium. I have read on here some guys say the back wall was spongy but I thought it was a real nice and solid. Also guys have said the Helim has more vibration and I would agree with that but I have to say it was a marginal amount and with it being a bare bow I feel that with accessories on it the minimal vibration would disappear. Originally I was knocking the .5 LBS difference in weight but I was surprised at how much I noticed the difference in weight. All in all I really liked both bows! And yes I have taken advise from here and shot many others and I have to say while some others like the Hoyt's and stuff where nice I still like Mathews. I'm kinda torn between the two bows. Who out there has the helium and who has the Z7X and what are your opinions on them?