C: Assigning structures

suppose we have the following type:

typedef struct {
    int bar;
    int baz;
    int foo;
} Something;

In order to do a copy, I usually do something like:

Something a, b;
...
memcpy ((void *) &a, (const void *) &b, sizeof(Something));
But also the following is legal (and far more quick to write).

Something a, b;
...
a = b;
Is there any disadvantage in doing the second one?

>>30
memcpy is a commonly used function, and it really can do with optimization in places. It's not all about assignments between structures. (I have no idea whether GCC is smart enough to catch many of the interesting/non-assignable cases though.)