Did a search but only found a question from 2011.
Has anyone used them? Feedback?
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My son hasn't used it (yet), but...a player from the Dodgers works out in the off season at the same facility as my son. I'll watch him go through his routine, and one of the things he does is slip a donut on his bat and does tee work, soft toss, and hits live pitching. This isn't the Hitting Jack It, but to me it validates the concept of using a weighted bat for training.
Son uses it as an element of offseason work. Among MANY other things that probably all help with bat speed. So it's impossible to give an assessment. But he likes underweight/overweight training implements and uses these as well as weighted balls, oversized hitting objects, etc.
Strength of the hitting jacket design is that it does mess too much with the "swing-weight" or "balance" of a balanced bat. Might balance out an end-weighted bat a bit. Would not use with a metal or mixed material bat; wood only.
