plaitar, have you gone to see a doctor about your knees? That seems like a more pressing issue! Also, when you ride your bike, are you mashing on the pedals, or do you maintain a nice high pedaling cadence? Higher rpms will help decrease the pressure on your knees. A properly fitted bike (especially seat height) will also ease pressure on your knees.
If you do end up getting a kit, will you need some help installing it? I've never had the opportunity myself, and we're in the same city...