Alright, so I experimented with not locking out today and it was odd to say the least. For bench I first started coming up just maybe an inch or two below lockout. At first, I could do about 5 to 6 more reps than normal with the same weight. So I went up on the next set. By the 3rd out of 5th work set the lactic acid buildup was pretty strong. My chest felt nearly rock hard. The only problem was, so did my triceps. I had a hard time finding a sweet spot with this type of movement that isolated the chest. I did it for all my other exercises and it produced the same results. By the last of all my work sets, I had to go down in weight because the pump I was receiving was nearly painful. I will still lockout on certain exercises though as it did not prove to be an advantage to not lock out on close grip bench and curls. Other people trying this, let me know how it goes, I'm curious as to what the sweet spot in the rep range is for bench using this technique.