I use paper versions only for rarer coins which are not catalogued on internet. I don't own one anymore, but I use libraries when needed. Prices are mostly ridiculous and don't give proper information. For example small change coins from exotic countries are valued too low and commemoratives too high.
Thats quite old catalog, but hope one have never payed that much for these coins. These sell for melt value and also did in 2010. Coin shops may have asked few euros more but €75 for BU or €95 for proof...
I use Krause PDFs. It has a lot more coins and prices, so it is more useful than let's say Numista. But Numista's prices I find to be closer to a real world in most cases.