Sure, those machines could help improve your concentration and hand eye coordination. If you remember the movie Mr. Baseball, there is even a part where the "Japanese coach" gives wiffle ball practice using golf balls. However, nothing will ever replace simply swinging a regular bat. I would only use this type of practice as a supplement.
These machines definately will help improve your concentration and hand eye coordination. I am a former pro baseball player for the St. Louis Cardinals and would love to do a video tutorial for you answering all your baseball questions. Please either reply to this or send us an email at [email protected]. Thanks!