I lock out or its not a full rep. When I write my workouts down I want to make sure I write them down correctly so I will preogress better, If I lock out its only for a half second though. Its not like I would be bigger if I didnt, not much difference imo
The only people who should be doing direct tricep work are the really advanced or injured. Lets face it, if you're doing heavy bench, ovehead press, dips, then you are already killing those relatively small muscles.
Even when I was bodybuilding, my best triceps exercise was push press! MOst people here seem to do chest and shoulders on different days, so that's two intense workouts each week already.
If you are a powerlifter and you've reached a pretty advanced level, then its different, but in general most people would benefit from more compound pressing exercises and less cable presses and dumbbell kick-backs.
I'm 6' 235lbs and drug free, and have not done direct arm work for three years, but have 17.5 inch arms.
Not to rob this thread with this (perhaps I'll start a new one) but you can't compare shoulders to triceps because of the mechanics, and unless you've tried eliminating direct triceps work for a decent period of time, then you can't say that it does not work for you to just do compound pressing movements. Maybe I'd allow a few near failure sets a week but that's really it! - any more and you're robbing all of your other pressing exercises. Powerlifters and ADVANCED steroided-up body builders are an exception to this, but the average person on here would benefit from drastically reducing their triceps exercises.