Very good deal because purchased at the right time.

The best compromise among the Nerf chargers is, in my opinion, that of 12 darts (or, for style, that of the 10 curved Demolisher.) Indeed, the 6 empties too fast (especially as for n crush or arrows or the spring, it is better not garnish the only 4 or 5 darts) (and, like all Nerve chargers, deplete it when we finished playing), while that of 18 (to load So to 15-16) is a bit too bulky. What a pity that the chargers 10 and 12 are not sold as an accessory!
The charger 18 is justified on the Rapidstrike (not the firing rate is phenomenal, but automatic firing involves keeping the finger on the trigger), also the limit on the Rampage and Raider (who themselves can shoot really fast when properly handled) and probably the Alpha Trooper, but not on the Retaliator, to whom the magazine 12 provided in series sufficient.
Bought less than 10 euros each, my two chargers 18, given the 18 provided darts, remain an excellent deal. Beyond 13 euros, maybe I would have preferred them-refills 30 darts.