My chihuahua learned incredibly fast and loved it.
No smell in the house. It does not last more than 7-10 max.
We ordered 2 grass boxes to place on our patio for our dog. We currently have astroturf in the garden which gets too hot for him to go on during the day, so the real grass patches are perfect for his midday toilet break without hurting his paws!
This made house training and apartment-living so easy for my puppy. 1,5 years later and he still loves his grass!