Reliable and fast internet connection
Ordering process was nice and simple.
Pick up location (Haneda Airport) went without any issues.
Set up of the SIM (using Android) as the included instructions said went smooth and worked immediately.
I had no problems with the internet connection. Most of the time pretty fast and reliable, I did have a stable internet connection pretty much wherever I went (Tokyo, Kyoto, Osaka, places in-between, ...).
I've been using Sakura Mobile a few times now and will continue to do so (whenever visiting Japan).