While I'd love to be able to confirm or deny the claim that the scent lasts up to 12 weeks, I simply haven't been testing them out long enough, but here are my thoughts so far.
Firstly, the scent.
My bottles are labelled "fresh". While the smell is fresh, I associate fresh with something less floral and synthetic than this smell. It's nice, but overwhelming. The instructions recommend 1 - 3 capfuls of scent beads, I use less than half a cap and my clothes smell nice but not like they've come out of a soap shop! The smell is a lot less overwhelming and synthetic post-washing and is quite pleasant.
Ease of use.
You just bung the beads into the drum with your clothes, couldn't be easier! I've never had problems with them not fully dissolving in a 40 degree wash and they don't stain clothes.
Overall.
I have to say I don't really feel like I would buy these because the scent in fabric conditioner is strong enough for me. If they conditioned clothes too, then maybe I would. The packaging design is really attractive and they do make washing smell really nice. I'd give them a good 7/10.