I am a big fan of Lotus Notes Traveler I have been working with it since the earliest beta builds.  Overall it has been a fairly stable product, but like any other system use it enough you will run in to issues.

Any time you open a PMR you can expect to be asked to provide logs, Traveler has greatly simplified that process by adding a Tell Traveler PMR command, (I believe this was added in 8.5.2)  allowing you to automatically collect and upload logs to your PMR.

While of course I would prefer not to have to open a PMR it is easier to have a streamlined way to upload logs.  I would love to see this implemented for more Domino Server features especially router and http.

Lotus Notes & Domino Wiki: Traveler Server Logs