I was doubtful this thing would work, but I bought a 4GB card from random Amazon reseller before my recent Japan trip.
it worked as soon as Intouched down! Couldn’t believe it. Unfortunately it stopped working for two hours the next day when I flew to Osaka but magically started working again.. only cost me $10 on my VZW travel pass
all in in all my speed was faster than travel pass and my buddy’s ATT roaming. Will definitely by again if going to a more expensive internet country (not Vietnam/Malaysia/etc...) or if I’m just lazy.