somehow it looks like i wandered into an old discussion, as i was wondering what i just bought on ebay for $300 and best use for it. The other research i have seen today and while bidding for the unit (used twice, hm hope we get more use out of it) is that the waveleng of the marc pro is way more advanced than other cheaper ems units and aids in recovery rather than overstimulation. We dont ice at all, never have and typically dont have a lot of pain post throwing, more muscle fatigue mainly Lats, but sometimes triceps and biceps. so thought this unit could help. seems overkill for a 14 yr old but the price wasnt bad.