I do them , but more with a controlled weight . Meaning I lift the weight on my own and come down very slow . Some people have a spotter and overload the bar so that they have the spotter lift it and they come down very slow on there own.

I think that is way to dangerous and would never do it. If I can't lift the weight on my own I'm not going to trust myself to bring in down on my own slowly.

I don't think it's better for mass , but it may help you blast through some sticky points in your lifts.

3-4 seconds down.

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