One thing I don't like about it is that you can't write to the browser on your own, but have to return the complete output at the end of the sub. This is a major problem for one part of my application, where reports are generated from a database. The reports could get quite large--larger than I'd want to load into memory at once if I could avoid it.

You can do something like this, if you want:

sub mymode {

#...

print $self->_send_headers;

# print your data;

$self->teardown;
exit( 0 );
}
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This is the method suggested on the CGI::App wiki to do an "early exit."