the fixing mechanism is definitely solid (as UNChris says), the wire suspension bit really does it's job.
it does get in the way of lights, but i just use one of these mounted on the side of the drops. the mount allows the light to turn 90 deg to point straight ahead:
my wife has the compact one and she quite likes it, but she has overpacked it on a few rides, so the lid doesn't close well. and it's not as easily accessible while in the saddle, since it opens with the lid in the way. also it's tall and narrow, so if you want something from the bottom it means fumbling around a bit. i'd stick with the classic.
the fixing mechanism is definitely solid (as UNChris says), the wire suspension bit really does it's job.
it does get in the way of lights, but i just use one of these mounted on the side of the drops. the mount allows the light to turn 90 deg to point straight ahead:
my wife has the compact one and she quite likes it, but she has overpacked it on a few rides, so the lid doesn't close well. and it's not as easily accessible while in the saddle, since it opens with the lid in the way. also it's tall and narrow, so if you want something from the bottom it means fumbling around a bit. i'd stick with the classic.