I don't think it does anything for me, but I lift fast all the time. Warmups, work sets, everything is as fast as I can push it.
Fazc had a post a while back about tricep dominant benchers versus chest dominant benchers. Chest dominant tended to be more explosive lifters, but not so good when the lift slows down, while triceps people were "slower" but better grinders. Same with posterior dominant squatters (slower) versus quad squatters, btw.
It makes sense to me, and I think if you are not naturally a dynamic bencher, then speed probably does work. But if you are already pretty explosive, probably doesn't do much but add volume as Tuscherer thinks.
I am Anton Zdravko Martin!
Best meet lifts: Sq 150 Kg (330 lb), Bench 120 Kg (264), DL 160 (352) @89 Kg (197)
Best gym lifts: Sq 375, Bench 280 (pause), DL 385 @205 or less
Goals beyond my wildest dreams, 600 Kg raw total, 200/160/240
Hack away at anything which isn't essential. Do what you love, and do it often. Fazc.
Everything competes for recovery so more assistance is not always the best idea. miked96