i just spent the past two hours reading reviews on this thing, and yet i *still* can't figure out if this thing is a good idea or not! - so, i'm hoping some of you who have actually purchased one can give me your expert input.. here's the deal - my 16yr old son wants a chin-up bar (aka pull-up bar - whatever you call these things)...so anyway, the one he was originally going to order requires that you screw it into/onto/above (whatever) the door frame - of course, my husband had a fit and so he's not getting that one, lol... so then, i find the Iron Gym Total Body Workout Bar - which uses cantilever technology, so supposedly there's no screws necessary - and supposedly you won't die from using it because it won't accidentally fall down while using it...supposedly...oh, and he's 6ft, and 150 pounds at the most...soaking wet (yeah, so he's gonna totally "bulk up" by using this, right? of course not...oh well, it's his money...that i give him weekly for doing nothing). and then there are the doorway requirements - and all sorts of differing opinions on what will and won't work for an older home...we have an older home - but it's not super old, lol - so i have no idea exactly how thick or thin or tall or short the door frame moulding and the width inside the door frame has to be or not be in order to use it with no problem..i did find one review where someone was so kind as to list the measurement requirements, but they wrote it in that crazy metric stuff (and they had so many freaking dimensions listed, i worried that i'd mess up even if i used a calculator...besides which, maybe theirs had different dimensions because they're obviously not from the US, lol). oh, and then there were those who say the "original" version of the Iron Gym is better, and others who argue that the "Xtreme" version is better...who's right? he doesn't care about having a bunch of different grips - so long as the grips he can use are correct for a regular chin-up. but i care about having one that isn't going to fall apart after a few weeks (i've read all sorts of stories involving the bolts/screws/plastic pieces/metal pieces - some say one's better than the other. any advice from those who've actually owned one will be greatly appreciated. :)