Easy to use
I purchased the diffuser with the Plumeria fragrance and have had no difficulty using it.
The cap keeping the diffuser oil is a bit difficult to pull out though.
I poured about two-thirds of the Plumeria into the diffuser and 5 reeds on my first go and it was just slightly stronger than I preferred.
So it might work better with having just half the bottle, but that depends on the size of your room and your preference.
Decreasing the number of reeds could also reduce the strength of the scent.