I just got the complete 1954 set at a library book sale. It is almost the same as the newer edition, although there were some changes and the later edition includes some books from the 20th Century.
I am a little concerned because I read that many of the translations used were older (because they were in the public domain and therefore reduced production costs) and more difficult than contemporary translations. But I am going to chip away at these, giving myself liberal credit for those that I read in college, and skimming through the math and science.

