As a big fan of Ilf and Petrov's masterpieces I couldn't watch this version. It contains quite simple Gaidai's humor but not sharp and intelligent humor of authors. Zakharov's version is much closer to book and embodies original jokes. And, of course, genius Mironov is No2 Ostap Bender after Yurski. Though actors are great in both versions, 77's did the best. The very important part of Ilf & Petrov's literature is the author's voice, which was masterfully implemented in 1977 (by the way the one who worked as author's voice was famous Rolan Bykov, who played Panikovsky in 1968 Zolotoy Telenok (Golden Taurus)) but Gaidai didn't use such feature and lost the majority of book's spirit.
Review of Twelve Chairs
