I got a cheap one off Amazon. Best random purchase in a while.
Had been having foot pain morning after games. Tried adding in soles and switching back to Nike having given UA a shot. Turns out, some of my problem is tight calves.
I hit my legs and feet with it regularly, and have been pain free. It's been great for other little tweaks and pains along the way too.
I have a hypervolt and use it daily. Well worth the investment. Esp for sore muscles post training, tight muscles or cramping during or after games.