I believe the most effective way of training is not by these high tech laser tag thingies that are actually not really very effective and it actually added weigh to the rifle (at least in my time).
I think a BB gun of some sort might be more useful. That way, you actually see the opponent hit.
BB gun can only be used for CQB practises due to their short range. Laser tag the 1st generation MILES is crap. Latest generation laser tag I tried before leaving the army, I am quite impress with it.