Recently it has come to my attention (kudos to Google Reader), that Cisco Press has released a CCIE RS v4.0 quick reference sheets.
CCIE Routing and Switching v4.0 Quick Reference (eBook), 2nd Edition
Has anyone (of those who will read this thread) already purchased aforementioned ebook and can comment on quality?
Thanks in advance for all the input

P.S. I'm considering purchase, just being cautious.