They're expensive toys. There are places that will take your money for force on force training using them though.
For most people Airsoft is the only practical way to train for some essential aspects of defensive shooting. It is useful as long as one takes its limitations into account, and takes the most realistic approach possible while training (simulation starts in the mind). It's better than simply going to a local range and shooting at a sheet of paper every 30 seconds--that can be useful, too, and practice with a real firearm is crucial, but most people don't do much more and for the most part cannot with a real firearm (unless they spend hundreds of dollars a pop for limited amounts of professional training).
As for expense, while Airsoft may be somewhat pricey for a toy, in the long run it's a relatively cheap way to get in a lot of practice shooting at multiple targets (helps with shooting speed in addition to accuracy), for example, for those who are not fortunate enough to have their own private range (most public ranges have pretty strict rules).
However, using a toy is not a substitute for actually being under fire.
Nothing is, but when used appropriately it can help make one far better prepared for the first (and maybe only) time that one is under fire.
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