Here is a post earlier on regarding ICG history. Keith Love founded and built the company in Denver, CO, he and I were YN's and ran a little coin business back in the early 1980's He is no longer affiliated with them.
https://goccf.com/t/121171I haven't delt with them in years so I have no current opinion on them, but they used to be a good grading company when they started out. After moving into the modern series they seemed to give out MS69/70 grades like candy. Today I have no idea how they rate - but I still occasionally buy ICG slabbed coins, just remember buy the coin not the holder. Their grading seems up to par for the most part, and I can't say I've ever seen a horribly misgraded coin in their holders, nor any fakes that slipped by. I always liked their holder better than ANACS, PCGS and NGC. In fact they are my second favorite slab after the early small ANACS holder. They also used Intercept gaskets to help prevent enviromental issues of the coin slabbed, a good thing IMO!
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013!
ANA Life Member #3288 in good standing since 1981, ANS, Early American Coppers Member (EAC), Colonial Coin Collectors Club member (C4), Conder Token Collector Club member (CTCC), Civil War Token Society (CWTS) member, Liberty Seated Collectors Club (LSCC) & Numismatic Bibliomania Society member (NBS), USMex, Member in good standing, 2¢ variety collector.
See my want page:
http://goccf.com/t/140440