Well here is the view from an FJ1200 point of view
The standard chain the owners club supply last just over 20 000 miles, but if used with a scott oilier can last 40 000 miles
My point of view
If you are going to do a lot of miles and ride in bad weather it’s a fantastic bit of kit, if you don’t plan on doing many miles and always ride in the dry you will be hard pressed to get your money back from the cost of the oilier.