As Irish has said stick with the heavy bag. The further you get away from the good old fashion heavy bag the worse the training effect. The heavy bag has helped build plenty of great fighters from way back in the day even before fighters wore gloves straight through to such great champions like Dempsey and Marciano and beyond. Even the naive who buy into the Bruch Lee myth know that Bruce lee had a special heavy bag made so that it could with stand his super amazing powerful kicks