They probably do bend but ive been running them now for 6 months and am quite competitive in my club so at least i don't have to buy replacements like i would if they snapped.
The other disadvantage is the weight that they add to the car. Unfortunately my club runs indoor in a school hall with loads of chairs stacked round the outside of the track and trips into these soon become too expensive to keep replacing graphite arms.
When i go outdoor in the summer for the Schumacher BTCC series im gonna go back to the graphite everything though.
For club meetings that arent even that competitive anyway (we dont have finals, just an FTD list that sorts out what heat your in next week) I've totally converted my TC3 into a Blue Alloy machine with every imaginable hopup (hence the name)