even if rubber bands work, if i got into extreme aerobatics or 3d i would definatly go with the bolts for several reasons.
#1 there is no way the wing will shift if you have a hard touch and go or something.
#2 sometimes if you put more rubber bands on to make it stiffer, it will pull the covering back and make unsigltly streach marks and crumples.\
#, you shouldn't worry about your fuse splitting wide open because if you get into that kind of flying you shouldn't have too many crashes, and even with a rubber band plane an uncontrolled crash (ie a radio hit, midair etc) will not be left in one piece so as soon as you are confidant in your flying skills, i agree, make the switch