Well, from a coolness aspect, it's quite reasonable, however, I think it suffers weakly from a maintainence aspect, in that others that may not be ask skilled in perl will be confused.

OTOH, ||= is very cool, and maintainable, in using it to set default values when none are provided:

sub mysub($$;$) {
   my ( $a, $b, $c ) = @_;
   $c ||= 3;   #c is 3 if not already defined
}
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(Of course, this assumes that the value on the left is in some 'error' state if it's zero or undef.)

Not that &&= doesn't have it's usefulness while being maintainable, eg:

my $flag = 1;
foreach (@item) {
   $flag &&= usable( $_ );
}
print $flag ? "All usable" : "not all usable";
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-----------------------------------------------------
Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain