What is Reddit's opinion of ICOCA check 残高確認?

From 3.5 billion Reddit comments

if you have a smart phone you can read it, https://play.google.com/store/apps/details?id=jp.gr.java_conf.yutsusaya.icocacheck&hl=ja

That or get the sony card reader, available at most large electrical stores.

http://traincard.net/katsuyou/icoca-rireki.html