The scottoiler is a constant drip, drip, drip. Usually while the engine is running. The nemo is a measured dose of oil which is given when the rider decides.. Normally I would guess, every 200-600 miles, depending on conditions. Cheaper to operate than a scottoiler as you can use normal gear oil. Rather than anything 'special' or more expensive. There is also very little that can go wrong with a nemo as it's extremely simple. And involves no modification or cutting into the bikes innards.
30th anniversary DCT 'Sport.