In our company we ditched rsyslog in favour of syslog-ng premium over a year ago and we are very satisfied with it. Rsyslog did regularily loose loglines, cut off too long lines or stalled the complete machine. Support was not available and after 4 or 5 tries on the mailing lists we eventually gave up.
Nowadays we run OSE on the clients and have premium edition on loghosts and we did not loose a single logline since.
Admitted, it is expensive. But maybe we will get a fork or additional GPL plugins providing reliable log transport in the future.