I've ordered a couple things from there and it's all arrived pretty quick (to be fair most/all things I've ordered from Jpn have come faster than it often does in from within the US - From Whitesville tee shirts to Japanese knives!)
Things I've ordered include Riken Bonito soup powder (a nice instant dashi that uses less traditional ingredients) https://www.amazon.co.jp/-/en/Riken-Bonito-Soup-Stock-17-6/dp/B0753M1TP2
and a rice pot by Staub originally for the Japanese market, which I think you can now get through regular Amazon.