As much as I hate to point you to another site, there is a fantastic review of the Magnum on epinions at:
Magnum Review on Epinions. I don't think you could get more info on this stroller anywhere.
Personally, it sounds like an excellent high-end stroller if you don't mind the mild weight factor (around 26 lbs depending on the chassis you decide to go with), but with removing the Magnum, the weight issues sort of becomes a non-issue as the components aren't as heavy when seperate.
Good luck! Let me know if you have any further questions.