It's okay for a change, but I don't think it's perfect.
When I think of a perfect rep, with a bench press for example, I think of a constant controlled descent over a couple of seconds, a strong contraction/hold at the bottom, an explosion from this position, only slowing as the arms reach full extension.
Repeat for as long as possible. If the person loses the ability to control the weights descent, that's the end of the set.
You get an explosove stimulus AND a long eccentric. On top of this you're also building stability by pausing and holding the weight at the bottom. Perfect rep.