I have been running the tobee craft shafts for a while now... over 6months, without one problem.... that said, and without defending k factory as such..... what did you expect from them?
They are lighter than stock..... unless you go for titanium...... they will be weaker..... Should they have lasted longer... maybe. But hell man, 6 months of hard use isnt that bad..... not like the old hpi "heavyduty" crap. Anyone still remember owning a racer 2? those suposadly hard outdrives lasted a month at the most.