Product came on time which  was great. It was for a double bed for a teenager.
We purchased the heavy duty ones because of the reviews. We have tried to contact our original manufacturer for replacement bed slats but they sold the company and the current company will not sell replacements. 

Unfortunately the bed slats had arrived with cracks, splits and terrible wood knots on several slats. The bed slats we felt would not support the weight of a mattress & a person over time.
Disappointing.
This will not discourage  me from buying in the future from Wayfair.