I did it a couple years ago, before I really knew what I was doing, and most likely too early. IIRC, I added about 20-ish pounds to my max. The thing I remember most about it was that it habituated me to high-volume, high-frequency benching.
Just went back in my training log and found it. Quest for Fire
Started 9/09/13 with a 5rm of 165 (calculated 1RM of 186 - used 176 for program layout), then benched a 1RM of 210 on 10/08/13. Problem was what to do afterwards, and I regressed.
"I would recommend Smolov Jr. to anybody. I wasn't sure if it would do much for me, as my bench is small to begin with, and I've less than a year lifting, and I used the minimum programmed increases, but it really helped. It ( the high sets low reps?) increased my confidence under the bar, and my ability to push through the tough reps. I have also noticed crossover strength into my press.
Rating: Three white lights. "