Yes, I think that there is a certain amount of finesse required, when setting up an automatic chain oiler. I've really researched them on other M/C message boards at length... and have seen successful operation of them with minimal mess. The secret is to just getting the flow right. Too often people want instant gratification with oiling the chain = instant mess.

Slow and sparingly is the key to the metering out of the oil in these systems. Ultimately it produces less fling and is very adequate in keeping the chain clean.