I lock out on the inclide press, but when flat benching, I only do the bottom half.
It saves your triceps, and also works the chest better beacuse the tension is never let off. The shorter ROM on the reps means that they can be done quicker, so that you can get more reps out before failure. This gives you a better pump.
I tend to do inclines first with heavy weight and then one pump set of 15-30 on the flat bench as above.