I do agree make sure you're not taking away from base defense, but prox mines are effect in offense. Example... mine the enemies entrance to the tunnels. Unless they're paying complete attention, they'll never think twice and assume that the mines are their own. I watched a Sakura, evil mobius, and 3 stealth suits die to this trick in on game. (note, i ran back twice and another hotwire got involved) Not only did we rack up kills, it kept opposing team from mining cause they thought they alread had.