The three scents are a nice touch, and replacing them every 3 months fits my routine well. The spray kicks in as it cleans, so the whole room smells fresh when I walk in.
Sebastian★★★★★
Wasn't sure the scent would actually reach the next room, but the spray kicks in on schedule and leaves a light trail behind the vacuum. Swapping the refill every three months is easy enough to remember.
Ava★★★★★
The fragrance actually fills the whole living room now instead of just the hallway, and I like that it sprays as the vacuum runs. Swapping it in took about ten seconds, and three months per refill feels reasonable.